Fact-checked by Grok 2 weeks ago

Decade

A decade is a of ten consecutive years, commonly used as a measurement in calendars, historical analysis, and everyday . The term originates from the word dekas (δέκας), meaning "a group of ten," which entered Latin as decas and was adopted into as décade before appearing in around the mid-15th century. In modern usage, decades are often denoted by the tens digit of the starting year, such as the referring to the years 2020 through 2029, facilitating discussions of cultural, political, and social changes over these intervals. Historically, the concept of grouping years into decades aligns with broader calendrical systems, including the , where it serves as a convenient subdivision for tracking events like economic cycles or generational shifts.

Etymology and Definition

Origin of the Term

The word "decade" entered the English language in the mid-15th century, derived from the Ancient Greek dekas (δέκας), meaning "group of ten," which passed through Late Latin decas (or decadem) and Old French decade (attested in the 14th century). This linguistic path reflects the term's roots in denoting a collection or division of ten units, stemming ultimately from the Proto-Indo-European root dekm- for "ten." In its earliest English usages, "decade" primarily referred to a literary or structural grouping of ten parts, rather than a strict temporal measure. For instance, it appeared in 15th-century texts referencing the historian Titus Livius (Livy)'s , whose surviving works were organized into "decades"—sets of ten books each—such as the First Decade covering early history. This application aligned with the word's classical origins, where it described divisions in scholarly or poetic compositions, occasionally extending to groups of ten days in or contexts, though such uses were less common in early English. By the late , the meaning began to shift toward a temporal , with "decade" denoting a of ten consecutive years, as seen in historical and chronicle writings of the era. This evolution solidified in the , when the term became a standard way to describe decade-long spans in prose and records, moving beyond purely literary divisions to broader chronological applications. The term's adoption mirrors the base in systems, emphasizing groupings of ten for organizational purposes.

Core Definition and Scope

A decade is defined as a of exactly ten consecutive years. This unit serves as a fundamental measure in chronological reckoning, encompassing any sequence of ten years without inherent alignment to specific boundaries unless contextually specified. More broadly, the term can refer to a group or set of ten items, as in literary divisions or a section of a comprising ten prayers, though in modern usage, especially in historical and cultural contexts, it most commonly denotes the temporal . In and , a decade describes a interval representing a of ten (e.g., from 1 to 10). The scope of a decade extends beyond rigid calendrical divisions to include both precise spans, such as the years 2020 through 2029, and more fluid cultural or thematic references where the term denotes an approximate ten-year interval in social, historical, or artistic contexts. It is distinct from related temporal terms like "decennium," which formally denotes a ten-year period in Latin-derived usage and is often interchangeable with decade in academic or legal settings, and "lustrum," an ancient Roman unit equivalent to five years tied to ceremonial purifications. The term's etymological root traces to the Greek "dekas," meaning a group of ten, reflecting its numerical foundation. Mathematically, a decade equates to an average of approximately 3,652.5 days in the , accounting for the inclusion of (typically 2 or 3 per decade) that adjust the standard 365-day year approximately every four years, with exceptions for century years. This approximation highlights the decade's role as a practical subdivision of longer epochs, facilitating analysis in fields from history to demographics while excluding sub-decadal or multi-decadal units.

Calendar Numbering Conventions

Zero-Based Numbering (0-to-9)

The convention for decades designates a ten-year period beginning with a year ending in 0 and ending with a year ending in 9, such as the 2020s encompassing the years 2020 through 2029. This approach groups years sharing the same tens digit in the , facilitating straightforward temporal categorization. In , zero-based decade numbering is formally employed to structure narratives and analyze socio-political developments within bounded intervals, as seen in references to the 1990s as a cohesive of post-Cold War transitions. Similarly, in astronomy, incorporates a year 0 to streamline calculations across epochs. Official records, including designations, adopt this system for programmatic timelines; for instance, the International Decade for Natural Disaster Reduction spanned 1990 to 1999, emphasizing risk mitigation over that interval. One key advantage of lies in its consistency with colloquial demarcations of larger eras, such as the informal treatment of the as 2000–2099, promoting intuitive alignment across scales without introducing discrepancies in everyday discourse.

One-Based Numbering (1-to-0)

One-based numbering for decades, also known as the 1-to-0 convention, defines a decade as the ten-year period beginning with a year ending in 1 and concluding with a year ending in 0. For example, under this system, the decade commonly referred to as the would span from January 1, 2021, to December 31, 2030. This approach aligns with ordinal counting from the start of the , treating decades as successive blocks that complete full cycles without including a year 0, similar to how the first decade of the runs from year 1 to year 10. The convention draws from human counting intuition, where sequences typically start at 1 rather than 0, reflecting natural progression in everyday enumeration such as age reckoning—where the first year of life completes at age 1—or sequential listings that prioritize the initial positive integer. This 1-to-0 method emphasizes the logical completion of a ten-year span, mirroring the structure of larger periods like centuries, which begin in years ending in 01 (e.g., the 21st century from 2001 to 2100). In contrast, the more prevalent zero-based alternative groups years from 0 to 9, prioritizing cultural familiarity over strict calendrical alignment. In everyday language and , the 1-to-0 numbering appears in discussions of temporal boundaries, particularly during decade transitions, where it supports arguments for precision in historical or chronological contexts. A survey indicated that about 17% of U.S. adults favored this convention, viewing the new decade as starting in 2021, though it remains less dominant than the zero-based system. Educational materials sometimes introduce it to illustrate debates on time measurement, helping students understand variations in and the absence of a year 0 in the AD system. Despite its logical basis, the 1-to-0 convention has drawbacks, including inconsistency with widespread cultural naming practices, such as referring to "the " as 1980–1989 rather than 1981–1990, which can lead to confusion in informal communication. This misalignment with popular usage often renders it less intuitive for broad audiences, despite its alignment with formal century divisions.

Historical Evolution of Conventions

The concept of a decade as a ten-year period traces its roots to , where the Latin term decennium referred to any interval of ten years, often used in administrative and celebratory contexts. emperors marked significant milestones with decennalia, public festivals and sacrifices held every ten years to commemorate the anniversary of their accession, integrating the idea of cyclical ten-year periods into imperial governance and religious practice. Although censuses, known as , occurred every five years to tally citizens and property, longer ten-year cycles like decennium influenced periodic assessments and historical reckonings. In medieval Europe, the —introduced in 45 BCE and widely adopted by the —provided the foundational structure for year-based dating, allowing informal grouping of years into decades for chronicles and ecclesiastical records, though without standardized numbering. The calendar's fixed leap-year cycle of 365.25 days per year supported consistent annual progression, which medieval scholars used to divide historical narratives into approximate ten-year spans, such as in monastic annals tracking events from the Carolingian era onward. The 18th and 19th centuries saw greater standardization following the reform of , which adjusted the system's accumulated errors by omitting ten days and refining leap-year rules; this shift, completed in Protestant regions like by 1752, favored zero-based decade numbering in scientific and astronomical texts to align with computational needs that incorporated a for proleptic calculations. For instance, works by astronomers like in the late employed zero-inclusive cycles for orbital predictions spanning decades, embedding the convention in emerging . The brought explicit debates on decade boundaries, particularly during the transition from 1999 to , when concerns over computer date formats amplified discussions on whether the —and thus the decade—ended on December 31, 1999, or January 1, ; this reinforced zero-based conventions (years ending in 0 through 9) in global standards, as international bodies and media aligned with the practical usage that treated as the start of a new and decade. The rise of and further shaped these conventions, with early s in the 1890s commonly referring to the period as "the nineties" in zero-based terms, while coverage of the 1900–1909 era mixed descriptors like "" or "nineteen hundreds" amid ambiguity at century turns; this inconsistency persisted until the 1980s, when the for Standardization's established unambiguous date representations using four-digit years for data interchange in computing and documentation.

Usage and Debates

Public and Media Adoption

In public discourse, the convention (grouping years from 0 to 9, such as 2010–2019 as the ) has gained widespread acceptance, reflecting intuitive alignment with calendar cycles and shared cultural markers. A survey found that 64% of Americans viewed the upcoming decade as beginning on January 1, 2020, and ending on December 31, 2029, underscoring a strong preference for this system over the alternative one-based approach (1 to 0). This preference is echoed in everyday language, where terms like "the teens" for 2010–2019 or "the twenties" for 2020–2029 have become commonplace without formal debate. Media outlets have similarly embraced zero-based conventions in their reporting and retrospectives, often framing decades around round-number transitions for clarity and audience familiarity. For instance, CNN's 2023 documentary series The 2010s explicitly covers the period from 2010 to 2019, highlighting key events within that span. The has followed suit, with articles and broadcasts referring to 2010–2019 as the in cultural reviews, such as end-of-year summaries that align events like the rise of with this timeframe. While occasional one-based references appear in niche historical analyses, major networks prioritize the 0-to-9 model to match public expectations. Regional variations exist in how earlier decades are named, influencing broader adoption patterns. , and public commentary frequently label 2000–2009 as "" or simply "," emphasizing the zero-inclusive start. In contrast, UK outlets like the often use "noughties" for the same period, a term blending "nought" (zero) with a playful nod to the era's novelty, though both regions consistently apply zero-based grouping to post-2010 decades for consistency. Social media has amplified zero-based adoption through viral hashtags that timestamp cultural moments, reinforcing the convention in real-time global conversations. The hashtag #2010s surged in usage during late 2019 retrospectives, capturing trends from smartphone ubiquity to streaming dominance across 2010–2019. Similarly, #2020s began proliferating on platforms like (now X) and as early as January 2020, tying into discussions of post-pandemic shifts and aligning precisely with the 2020 start date to foster . This digital reinforcement has made the 0-to-9 system the default in , bridging regional differences and embedding it in online lexicon.

Common Misconceptions and Controversies

One common misconception involves the alignment of decades with centuries and millennia, where individuals erroneously claim that the period 2000–2009 marked the start of the new . In reality, due to the absence of a in the calendar system established by in the , the third millennium technically began on , 2001, making 2001–2010 the first full decade of that era. This error often stems from public perceptions influenced by the high-profile celebrations surrounding the year 2000 transition, which conflated decimal roundness with calendrical precision. The Y2K transition amplified debates over decade boundaries, particularly whether the concluded on December 31, 1999, or December 31, 2000. This controversy arose amid widespread anxiety about the "millennium bug"—a potential failure in computer systems unable to process dates beyond 1999—leading to dual public celebrations: major global events on 1999 to mark the perceived end of the and , followed by additional observances in 2000. The U.S. Naval Observatory clarified that, consistent with astronomical and historical conventions lacking a , the ended on December 31, 2000, yet popular media and festivities treated 2000 as a symbolic turning point, perpetuating the confusion. Linguistic debates further highlight divisions in decade nomenclature, especially for periods like the , where purists favor "the tens" (1910–1919) to align with sequential numbering, while populists sometimes propose "the teens" (drawing from numerical terms like thirteen to nineteen). Historical usage in the early predominantly employed "the tens" for the , as evidenced in mid-century references, though "teens" appeared sporadically by and gained traction in informal contexts due to its phonetic familiarity. Linguist notes that "tens" prevailed historically for clarity and avoidance of associations with , a pattern likely to influence naming for later decades like the . These disputes reflect broader tensions between formal calendrical logic and colloquial convenience in English.

Examples from Recent History

The civil rights movement in the United States during the 1960s exemplified the zero-based numbering convention, spanning from 1960 to 1969 and marking a period of intense activism and legislative breakthroughs that dismantled institutionalized segregation. Key events included the 1960 Greensboro sit-ins, which sparked nationwide student-led protests and the formation of the Student Nonviolent Coordinating Committee (SNCC); the 1961 Freedom Rides, involving over 1,000 volunteers challenging segregated interstate travel; and the 1963 Birmingham campaign, culminating in the March on Washington where Martin Luther King Jr. delivered his "I Have a Dream" speech to 250,000 attendees. This decade also saw the enactment of the Civil Rights Act of 1964, which prohibited discrimination based on race, color, religion, sex, or national origin, and the Voting Rights Act of 1965, following the Selma to Montgomery marches with 25,000 participants, effectively enfranchising millions of Black voters. By 1968, the Fair Housing Act addressed housing discrimination amid widespread unrest after King's assassination, solidifying the 1960s as a transformative era under the standard zero-based decade framework. The , defined as 1990 to 1999 under zero-based conventions, saw end-of-decade celebrations centered on December 31, 1999, which ignited widespread debates about the precise timing of decade and transitions. Lavish parties and global festivities marked the turn into as the symbolic close of the , driven by public anticipation despite purist arguments that the decade and century technically ended on December 31, , due to the absence of a in the . This controversy highlighted tensions between cardinal (year-number-as-age) and ordinal (year-number-as-sequence) interpretations of dating systems, with the majority favoring 1999 as the end to align with common usage, leading to preparations and millennial hype that overshadowed stricter historical accuracy. The rise of in the 2010s, conventionally from to , transformed global communication and culture, with platforms like reaching 1 billion users, expanding to include video sharing and a 280-character limit, and becoming a hub for influencer-driven content after its 2012 acquisition by . This period saw user numbers surge from under 1 billion in to over 3 billion by , shifting focus from personal connections to curated, attention-seeking posts, including the launch of Snapchat's disappearing Stories in 2013 and TikTok's short-form videos in 2016, which amassed 1.5 billion downloads. However, some media outlets extended decade retrospectives to include 2020, citing the pandemic's disruption as a fitting capstone that blurred the boundary and amplified social media's role in information dissemination and activism. As of 2025, the —spanning 2020 to 2029 under zero-based numbering—have been profoundly framed by the in their early years, beginning with global lockdowns in March 2020 that reshaped daily life, economies, and for millions. The virus, declared a by the on March 11, 2020, led to approximately 7.1 million confirmed deaths worldwide as of October 2025, widespread adoption, and cultural shifts like reduced urban commuting and persistent health measures such as vaccinations. This event defined the decade's outset, influencing electoral outcomes through public discontent over restrictions and economic fallout, while ongoing effects like learning disruptions and inflation continue to echo into the midpoint of the .

Cultural and Contextual Applications

Role in Historical Analysis

Decades serve as practical units for grouping historical events and trends, enabling historians to conduct thematic studies of phenomena such as economic cycles and generational shifts. By aggregating occurrences within ten-year spans, scholars can identify patterns, like the post-World War II economic boom from to the early , which facilitated analysis of prosperity and across generations. This approach allows for focused examinations of how broader forces, including technological advancements and demographic movements, unfold over manageable intervals, providing a framework for understanding continuity and rupture in societal development. In historiographical methodologies, decades are often integrated into larger periodizations to refine analysis, as exemplified by Eric Hobsbawm's framework in his study of the "short twentieth century" (1914–1991). Hobsbawm subdivided this era into phases such as the "Age of Catastrophe" (1914–1945) and the "Golden Age" (1945–1973), incorporating decade-like segments to explore themes of crisis, recovery, and decline within his concept of extended centuries. This method highlights how decades can delineate sub-themes, such as the interwar instability of the 1920s and 1930s or the welfare state expansions of the 1950s and 1960s, without adhering strictly to calendar boundaries. Despite their utility, decade-based periodizations face significant limitations due to their arbitrary boundaries, which often overlook pivotal mid-decade transitions that disrupt thematic coherence. For instance, the , triggered by the embargo following the , marked a sharp economic inflection point that divided the into pre- and post-crisis phases, challenging the decade's integrity as a unified analytical unit. In , the quantitative branch of , decade-based indices provide essential tools for empirical analysis by aggregating data on variables like GDP growth, trade volumes, and labor markets to model long-term cycles. Scholars apply econometric techniques to decennial datasets, such as U.S. figures or statistics compiled every ten years, to quantify impacts of events like industrialization waves or recessions, revealing patterns that qualitative narratives might miss. This approach, pioneered in the , underscores decades' role in bridging raw data with theoretical models, though it requires caution against aggregation biases that mask intra-decade variations.

Representation in Popular Culture

Decades have long been stylized in popular culture as shorthand symbols of distinct eras, capturing the zeitgeist through vivid archetypes that resonate across generations. The 1920s, often dubbed the "Roaring Twenties," are epitomized by the flapper—a liberated young woman embodying rebellion against Victorian norms through bobbed hair, short skirts, and jazz-age exuberance, as seen in cultural icons like the characters in F. Scott Fitzgerald's The Great Gatsby. Similarly, the 1980s evoke excess and innovation via synth-pop, a genre defined by electronic synthesizers and artists like Depeche Mode and Duran Duran, whose neon-drenched videos and anthems like "Just Can't Get Enough" captured the decade's futuristic optimism amid economic boom and MTV's rise. The 2000s, in turn, are inextricably linked to the explosion of reality television, with shows like Survivor and American Idol pioneering unscripted drama and audience participation, reflecting a shift toward voyeuristic entertainment in the post-9/11 digital age. Media frequently employs decade retrospectives to nostalgically reconstruct these periods, blending humor, drama, and cultural critique in films and series that span exact ten-year spans. For instance, (1998–2006) chronicles teenage life in Point Place, , from 1976 to 1979, using era-specific references like , Watergate fallout, and to evoke the decade's transitional malaise and youthful escapism. Such portrayals often highlight the as a bridge era, with films like Dazed and Confused (1993) extending the lens to late-1970s high school antics, emphasizing marijuana culture and as antidotes to . These depictions not only reference one-based numbering conventions (e.g., 1970–1979) but also amplify the decade's sensory details—afros, lava lamps, and Ford Pintos—to immerse audiences in a romanticized past. Fashion revivals underscore the cyclical nature of decade aesthetics, with trends resurfacing every 20 to 30 years to fuel nostalgia-driven commerce and self-expression. The 1990s grunge style, pioneered by bands like Nirvana and characterized by plaid flannel, ripped jeans, and Doc Martens, rejected 1980s glamour for an anti-establishment ethos rooted in Seattle's music scene; its resurgence in the 2020s, seen in runway collections from designers like Marc Jacobs and streetwear adaptations by Gen Z influencers, blends original rawness with sustainable twists like upcycled denim. This pattern mirrors broader cycles, where 1970s bohemian maximalism influences 2000s indie fashion, perpetuating a cultural dialogue that commodifies historical moments for contemporary relevance. Generational labels further entwine decades with pop culture identities, framing cohorts as products of their formative years' cultural outputs. The , born primarily from 1946 to 1964 and thus shaped by the post-World War II economic surge and counterculture upheavals, are often depicted in media as idealistic rebels tied to Woodstock-era rock and civil rights anthems, influencing portrayals in films like (1994). These labels, while spanning multiple decades, anchor narratives around pivotal ten-year shifts, such as Boomers' transition from conformity to activism, reinforcing how uses eras to define and intergenerational tensions.

Variations in Non-Western Calendars

In the lunisolar calendar, the term xun (旬), primarily denoting a 10-day period, is also used in the context of human lifespan to refer to 10-year spans and age milestones, such as qi xun denoting 70 years. This usage stems from the calendar's integration of the , where the 10 (tiangan) repeat every 10 years to label years, influencing astrological interpretations. In , decade cycles—known as "Major Luck Cycles" or da yun—divide an individual's life into personalized 10-year segments based on birth elements (e.g., Metal, ), with fortune determined by alignment with the sexagenary system's stems and branches; for instance, two consecutive favorable cycles might span ages 25–45 for someone born in a Metal element year. In Hindu lunisolar calendars, such as the , 10-year periods manifest primarily in Vedic astrology's Vimshottari Dasha system, where planetary periods (mahadashas) govern life events, including a 10-year cycle ruled by the that emphasizes emotional and familial influences. This contrasts with Western decades by being individualized and astrologically driven rather than calendar-wide, though the broader 60-year samvatsara cycle (six decades) structures cosmic time in . Quantitative analysis in astrological texts assigns the Moon dasha exactly 10 years within a 120-year lifespan total, underscoring its role in predictive timing over exhaustive life benchmarks. The Islamic Hijri calendar, a purely lunar system of 354–355 days per year, treats a decade as straightforwardly 10 consecutive years from the epoch of the Prophet Muhammad's migration () in , without unique nomenclature or cyclical grouping akin to Eastern systems; this results in decades drifting approximately 10–11 days earlier each year due to the lunar shortfall. Historical references, such as the "Year of Delegations" in the 10th (632 ), highlight event-based significance but maintain linear progression. In the traditional , influenced by Chinese models but overlaid with imperial nengō (era names) since 645 , decades lack fixed definition due to eras varying in length (e.g., the spanned 31 years from 1989–2019), though the underlying implicitly supports 10-year stem progressions for zodiacal purposes. Modern Japan adopts Gregorian decades alongside era years, blending conventions without altering the core 10-year interval. The Maya Long Count calendar employs hierarchical units where the closest to a decade is the tun (approximately 1 year of 360 days), but larger cycles like the katun (20 tun, or ~20 years) dominate for historical reckoning, rendering a precise 10-year "decade" absent; instead, time is tracked in base-20 (vigesimal) increments from a mythical creation date in 3114 BCE.

References

  1. [1]
    https://www.merriam-webster.com/dictionary/decade
  2. [2]
    DECADE Definition & Meaning - Dictionary.com
    a period of ten years: the three decades from 1776 to 1806. a period of ten years beginning with a year whose last digit is zero: the decade of the 1980s.Missing: etymology | Show results with:etymology
  3. [3]
    Decade - Etymology, Origin & Meaning
    Originating mid-15c. from Old French décade, Late Latin decadem, and Greek dekas, decade means a group or division of ten parts.
  4. [4]
    DECADE definition in American English - Collins Dictionary
    1. a period of ten years. the three decades from 1776 to 1806 ; 2. a period of ten years beginning with a year whose last digit is zero. the decade of the 1980s.Missing: etymology | Show results with:etymology
  5. [5]
    Decade Definition & Meaning - YourDictionary
    Origin of Decade. Middle English a group of ten from Old French from Late Latin decas decad- from Greek dekas from deka ten dekm̥ in Indo-European roots.Missing: etymology | Show results with:etymology
  6. [6]
    The Boke of Noblesse.
    ... Boke of Noblesse Author: Unknown Editor: John Gough Nichols ... In example I rede in the Romayns stories of Titus Livius in the booke of the first decade ...
  7. [7]
    decade noun - Definition, pictures, pronunciation and usage notes
    Word Originlate Middle English (denoting each of ten parts of a literary work): via Old French and late Latin from Greek deka 'ten'. The current sense dates ...
  8. [8]
    DECADE | definition in the Cambridge English Dictionary
    DECADE meaning: 1. a period of ten years, especially a period such as 2010 to 2019 2. a period of ten years…. Learn more.
  9. [9]
    When Will the Next Decade Start: 2030 or 2031? - Time and Date
    Decades—periods of ten years—begin when the year count ticks over from a year ending with 9 to a year ending with 0. For example, New Year's Day 1980 marked the ...
  10. [10]
    What Is a Decade? - Cambridge Proofreading
    Apr 12, 2025 · A decade consists of 10 years. The term originates from the Greek word dekas, meaning “a group of ten.” In both everyday language and formal ...Missing: etymology | Show results with:etymology
  11. [11]
    DECENNIUM Definition & Meaning - Merriam-Webster
    The meaning of DECENNIUM is a period of 10 years : decade.
  12. [12]
    LUSTRUM Definition & Meaning - Merriam-Webster
    1. a period of five years 2. a : a purification of the whole Roman people made in ancient times after the census every five years b : the Roman census.
  13. [13]
    Decade - Definition, Meaning & Synonyms - Vocabulary.com
    A decade is a period of ten years. Decade contains dec, which is used in words that have to do with tens.
  14. [14]
    Decade, Century, Millennium: Measurements of Time | Smartick
    Dec 11, 2024 · In this post we're going to look at measurements of time that refer to quantities of years: biennium, lustrum, decade, century, millenium.
  15. [15]
    Decade - Math.net
    In the 0 to 9 method, we count the decade starting from years ending in 0 up till a year ending in 9. For example, using this method, the year 2000 marked the ...Missing: UN | Show results with:UN
  16. [16]
    Numbering Should Start at Zero | Hacker News
    Jul 16, 2023 · Arguably, this is because the common definition of modular arithmetic is itself zero-based: “modulo N” maps all integers into the numbers [0,N-1] ...Missing: rationale | Show results with:rationale
  17. [17]
    Astronomical Year Numbering and the Common Era Calendar
    A calendar using the astronomical system numbers years in a fundamentally different way from the traditional Gregorian Calendar.Missing: decade | Show results with:decade
  18. [18]
    Year Dating Conventions - NASA Eclipse
    Feb 25, 2008 · The astronomical year 0 corresponds to the year 1 BCE, while the astronomical year -1 corresponds to 2 BCE. In general, any given year "x BCE" ...Missing: decade | Show results with:decade
  19. [19]
    DRR and UNDRR's history
    1990-1999: The International Decade for Natural Disaster Reduction. ... "The GA recognizes the importance of reducing the impact of natural disasters for all ...
  20. [20]
    https://today.yougov.com/topics/society/survey-results/daily/2019/12/02/6529e/1
  21. [21]
    When Does the New Decade Start? | Almanac.com
    Referring to decades by cardinal numbers, we have "the 2010s" (2010-2019), "the 2020s" (2020-2029), etc. Referring to decades by ordinal numbers, we would ...Missing: UN | Show results with:UN
  22. [22]
    When Does the New Decade Begin: This Week, or a Year From Now?
    Dec 31, 2019 · The next decade will begin on Jan. 1, 2020, and end on Dec. 31, 2029. For others, it won't start until Jan. 1, 2021, concluding on Dec. 31, 2030.
  23. [23]
    LacusCurtius • Decennalia (Daremberg & Saglio)
    Apr 10, 2016 · Under the Roman empire, public holidays celebrated every ten years. Games and solemn sacrifices had been instituted in Rome to ask the gods to preserve the ...<|separator|>
  24. [24]
    Julian calendar | History & Difference from Gregorian ... - Britannica
    Oct 2, 2025 · The year was divided into 12 months, all of which had either 30 or 31 days except February, which contained 28 days in common (365 day) years ...Missing: medieval | Show results with:medieval
  25. [25]
    20 Years Later, the Y2K Bug Seems Like a Joke—Because Those ...
    Dec 30, 2019 · The term Y2K had become shorthand for a problem stemming from the clash of the upcoming Year 2000 and the two-digit year format utilized by early coders.Missing: endings | Show results with:endings
  26. [26]
    Newspaper | History & Facts | Britannica
    Oct 16, 2025 · Competition in New York City between Joseph Pulitzer, who owned the World from 1883, and William Randolph Hearst (Journal, 1895) led to excesses ...<|separator|>
  27. [27]
    People Can't Even Agree On When The Decade Ends - NPR
    Dec 27, 2019 · 64% of Americans said the next decade will begin on Jan. 1, 2020, and end on Dec. 31, 2029. But nearly 20% said they weren't sure.Missing: UN | Show results with:UN
  28. [28]
    CNN - Facebook
    Apr 21, 2023 · It was the decade of social media, social movements, peak TV and major political events. The new CNN Original Series The 2010s premieres Sunday, ...
  29. [29]
    BBC News - Decade dilemma - whatever to name it?
    Dec 31, 2009 · The first problem in the search to name the next decade is that the decade just past never really had one. In 1999 and 2000, various terms were ...
  30. [30]
    It's 2002 - and the decade still has no name - BBC News | UK
    Jan 2, 2002 · We still don't know what to call this decade of ours. Is it the Noughties, the Nillies, the Oos, the Zeroes? The uncertainty can't be good ...
  31. [31]
    It's hard to know how to define the 2010s, but OMG it's #2020
    Dec 20, 2019 · Where would the 2010s be without the ubiquitous # sign. Would “#MeToo” even be considered a movement without it? Hashtags played an integral ...
  32. [32]
    The 2010s: Hashtags And Social Movements - NPR
    Dec 28, 2019 · We at the hashtags that spawned the decade's biggest social movements. Gene McVay, Marcus Hunter and Tarana Burke discuss their roles.
  33. [33]
    On tens, teens, or whatever - DCblog
    Dec 31, 2009 · During the middle years of the century, people talked a lot about 'the tens, twenties, and thirties'. Tens was the predominant usage. However, ...
  34. [34]
    Topic no. 412, Lump-sum distributions | Internal Revenue Service
    Sep 16, 2025 · Use the 10-year tax option to figure the tax on the total taxable amount (if you qualify). Roll over all or part of the distribution. No tax is ...
  35. [35]
    [PDF] Civil Rights and the 1960s: A Decade of Unparalleled Progress
    The decade began with institutionalized segregation still in- tact and massive resistance to school integration in the South.Missing: 1960-1969 zero-
  36. [36]
    A year in a thousand - The debate about when the millennium ends
    Feb 10, 1990 · They claim that 1990 is the last year of the ninth decade and that the century will end on the last day of 2000. The basis for this argument
  37. [37]
    The Debate of the Millennium -- When, Exactly, the ... - SFGATE
    Dec 27, 1999 · The 20th century will end Dec. 31, 2000, but everybody will be celebrating (or praying desperately) on New Year's Eve, Dec. 31, 1999, ringing in ...
  38. [38]
    End of a decade: Here's how social media has evolved over 10 years
    Dec 19, 2019 · Over the past 10 years, social media has largely evolved from keeping in touch with others to flaunting what we have for attention or curating unrecognizable ...
  39. [39]
    The 2010s: Trends we loved and hated | CNN
    Dec 31, 2019 · Hated: Hoverboards · Loved: Epic franchises · Hated: Remakes for remakes' sake · Loved: Body-positive marketing · Hated: Facetune · Loved: The ALS ...Missing: names BBC
  40. [40]
    EDITORIAL: As we reach the midpoint of the 2020s, COVID-19 has ...
    Dec 28, 2024 · On Wednesday, we will embark on 2025, and it will be the precise midpoint of the 2020s. It's anyone's guess what will unfold over the next five years.Missing: 2020-2029 | Show results with:2020-2029
  41. [41]
    How to Periodize History: 2020 and the Decade Dilemma
    Jan 10, 2020 · Indeed, decades, as defined in ISO 8601, are the years XXX0 through XXX9 . ... For example, using J to denote decades, “the 2020s” are represented ...
  42. [42]
    https://www.capture.com/blogs/insights/what-was-popular-in-the-80s
  43. [43]
    Cliometrics – EH.net - Economic History Association
    Cliometrics has three obvious elements: use of quantifiable evidence, use of theoretical concepts and models, and use of statistical methods of estimation and ...Missing: indices | Show results with:indices
  44. [44]
    57 Fashion Trends, Music, Movies, Events, and More That Were ...
    Mar 25, 2025 · This article covers 56 popular 80s trends. Keep reading to learn about fashion, toys, music, movies, TV shows, historical events, pop culture, and more
  45. [45]
    17 Iconic Pop Culture Moments That Define The 2000s
    Aug 7, 2024 · The early 2000s were truly one of the most iconic and wild ages in pop culture history. After all, the early 2000s gave rise to the dawn of reality TV.
  46. [46]
    10 Best Modern TV Shows About the 1970s, Ranked - Collider
    Jul 27, 2024 · We rank the best TV shows that perfectly showcased the 1970s, from White House Plumbers to That '70s Show.
  47. [47]
    That '70s vibe: It's the decade of choice for comedies
    Mar 3, 2008 · The mood of the '70s is often viewed as a period of cynicism and languor: both innate qualities of comedy.
  48. [48]
    How the Grunge Aesthetic Stands the Test of Time | Vogue
    Oct 28, 2024 · The grunge aesthetic didn't truly blossom until the early '90s. But before it became a full-fledged fashion phenomena, it was a counterculture and an ethos.
  49. [49]
    90's Revival: Why Is This Iconic Era Shaping Today's Fashion?
    Nov 19, 2024 · 90s fashion evokes a sense of nostalgia infused with modern-day styling—but it's more than just that. Reviving an era now goes beyond style ...
  50. [50]
    A Year-by-Year Guide to the Different Generations - Parents
    Sep 26, 2025 · A Guide to Generations, By Birth Year ; Baby Boom Generation, Born 1946–1964 ; Generation X · Born 1965–1980 ; Millennial Generation or Generation Y ...Baby Boomer Grandparents · Helicopter Parenting · Here’s What Generation X Is...
  51. [51]
    Boomers, Gen X, Gen Y, Gen Z, Gen A and Gen B explained - Kasasa
    Sep 3, 2025 · Baby Boomers: Baby boomers were born between 1946 and 1964. They're currently between 61 and 79 years old (approximately 73 million in the U.S.) ...
  52. [52]
    Calendar, chronology and astronomy (www.chinaknowledge.de)
    The Branches are combined with the Ten Stems to a cycle of sixty years. While the Ten Stems represent a decade of years, the Twelve Branches constitute a " ...
  53. [53]
    Chinese Astrology Major Decade Cycle - Best 20 Years
    Before studying your Decade Cycle, you need to know your Five Elements (Metal, Water, Wood, Fire and Earth) and which is your lucky element from Chinese Fortune ...
  54. [54]
    Dashas—the time periods in Vedic astrology - Indastro
    They run as follows— Ketu – 7 years, Venus– 20 years, Sun – 6 years, Moon – 10 years, Mars – 7 years, Rahu – 18 years, Jupiter – 16 years, Saturn – 19 years, ...
  55. [55]
    Islamic Calendar 2025 - Hijri Calendar | Islamic Relief UK
    The Hijri calendar consists of the following 12 months in numerical order: Muharram; Safar; Rabi Al-Awwal; Rabi Al-Thani; Jamada Al-Awwal; Jamada Al-Thani ...Missing: decade | Show results with:decade
  56. [56]
    The Japanese Calendar | Nippon.com
    May 10, 2019 · The system was introduced in 645, and there have been 248 era names in total. Since 1868, there has been just one era name associated with each ...Missing: decade | Show results with:decade
  57. [57]
    The Calendar System | Living Maya Time
    The 13 baktun cycle of the Maya Long Count calendar measures 1,872,000 days or 5,125.366 tropical years. This is one of the longest cycles found in the Maya ...Missing: decade | Show results with:decade<|control11|><|separator|>