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Semi

'''Semi''' is a prefix derived from Latin, meaning "half" or "partially," commonly used in English words such as or semifinal. It may also refer to various organizations, people, and other uses, as detailed in the following sections.

General Usage

As a Prefix

The prefix "semi-" originates from Latin sēmi-, meaning "half," and is ultimately derived from the sḗmi-, also signifying "half." In English, it functions as a combining form to denote partiality, incompleteness, or division into halves, entering the language in the through words like semicircular (attested around 1432–1450) and semi-mature (circa 1440). Common examples illustrate its role in word formation: refers to half of a circle, describes a material exhibiting partial electrical conductivity, and semiannual indicates occurrence twice a year. In scientific and mathematical contexts, "semi-" appears in terms like semi-major axis, which denotes half the length of the major axis of an elliptical in astronomy, and semiconditional in , referring to presuppositions that are partially conditional, as in certain linguistic accommodations. Historically, "semi-" evolved alongside similar prefixes denoting "half," such as demi-, borrowed into English via Old French from Latin dimidius ("divided in half"), often used in mythological or diminutive senses like demigod, and hemi-, from Greek hēmi- ("half"), which predominates in technical fields such as biology (hemisphere) and chemistry. While semi- and hemi- share a common Indo-European ancestry and are largely interchangeable for "half," demi- tends toward notions of partial divinity or reduction, reflecting their distinct linguistic pathways into English.

As an Abbreviation

In sports tournaments, "semi" primarily serves as a abbreviation for "semifinal," referring to the preliminary round that determines the finalists in competitions. This usage emerged by shortening the full term in early 20th-century , with the first known recorded use appearing in 1912. It quickly became prevalent in informal speech and , as seen in phrases like "The team advanced to the semis" during events such as Grand Slams or soccer matches. Beyond sports, "semi" abbreviates "semi-automatic," a term describing firearms or mechanisms that automatically reload after each shot but require a separate trigger pull for firing, with origins traced to 1900–1905 in technical contexts. In and , it denotes "semi-detached" housing, where two dwellings share a single common wall while remaining structurally independent, a first documented in English usage around 1845 to describe partially attached buildings. The abbreviation's cultural footprint is most evident in sports media and , where "semis" has permeated global reporting since the , fostering concise narratives in broadcasts and articles that heighten excitement around progression. This reflects broader linguistic trends toward efficiency in competitive contexts, influencing casual fan discussions across platforms like print journalism and online forums.

Organizations

Semiconductor Equipment and Materials International (SEMI)

Semiconductor Equipment and Materials International () was founded in 1970 in to foster in the . Today, it is headquartered at 673 South Milpitas Blvd. in , and connects over 3,000 member companies spanning the global and . SEMI's mission is to accelerate member-driven solutions to challenges through connection, , and , thereby advancing the growth and prosperity of its members' ecosystems. SEMI's key activities include developing over 1,000 technical standards, such as those in the E series for equipment and interfaces that ensure compatibility across manufacturing tools and processes. These standards, created by more than 5,000 volunteers over five decades, reduce manufacturing complexity and speed time-to-market for innovations. Additionally, SEMI organizes seven annual SEMICON expositions worldwide, including SEMICON West and SEMICON , which serve as premier platforms for industry professionals to network, showcase technologies, and address emerging trends. Membership in SEMI provides benefits such as access to new business opportunities, influence on industry trends and policies, and discounts on events, market data, courses, and standards. Globally, SEMI drives impact by facilitating collaboration among suppliers, manufacturers, and end-users, which has been crucial for enhancing following the chip shortages. In response to these disruptions, SEMI launched its Supply Chain Management Initiative in 2023, pooling best practices to improve agility and mitigate future risks across the . In 2025, expanded its scope through initiatives like the Smart Data- program, which explores energy-efficient computing architectures for applications, and by featuring as a key topic in events such as SEMICON to support standards development in emerging technologies.

SEMI Foundation

The SEMI Foundation is the nonprofit arm of the Semiconductor Equipment and Materials (SEMI) organization, founded in 2001 as a 501(c)(3) charitable entity to advance education and career pathways in high-technology sectors, with a primary emphasis on the microelectronics industry. Its mission centers on creating economic opportunities for workers by developing tools and programs that enable companies to attract, train, and retain a diverse, skilled , while also connecting job seekers to rewarding careers in semiconductors. A flagship program of the foundation is the SEMI Career and Apprenticeship Network (SCAN), launched in 2022 as a registered apprenticeship initiative customized for the microelectronics sector. SCAN delivers hands-on apprenticeships, pre-apprenticeship training, and certifications in foundational and specialized skills for high-demand roles, particularly targeting underrepresented communities to build an inclusive talent pipeline. The program operates through state-specific collaborations, such as in Michigan and California, partnering with employers, educators, and agencies to facilitate paid work experiences and career awareness activities from K-12 through professional levels. The foundation's broader initiatives include strategic partnerships with schools and universities to integrate curricula into educational programs, provision of scholarships for aspiring high-tech professionals, and targeted efforts to promote equitable access to careers. These activities encompass K-12 outreach for , veteran transition support via SEMI Vetworks, and resources like career exploration platforms to match individuals' skills and interests with industry opportunities. By fostering these pathways, the SEMI Foundation contributes to U.S. CHIPS Act objectives for expanding the domestic workforce, emphasizing inclusive hiring practices to address talent shortages and support industry growth.

People

Athletes Named Semi

Several prominent athletes bear the first name "Semi," a moniker particularly common among individuals of Pacific Island heritage, where naming practices often reflect cultural, familial, or linguistic traditions emphasizing community and identity. This section highlights key figures in rugby and basketball, focusing on their professional achievements and contributions to their sports. Semi Radradra, born January 13, 1992, in Fiji, is a dual-code rugby player renowned for his powerful running and offloading skills in both rugby league and union. He began his professional career in rugby league with the Parramatta Eels in the National Rugby League (NRL), debuting in 2013 and playing through 2016, during which he scored 42 tries in 66 appearances and earned Dally M Team of the Year honors in 2015. Transitioning to rugby union in 2017, Radradra joined RC Toulon in France's Top 14, then moved to Union Bordeaux Bègles (2019–2021) and Bristol Bears in England's Premiership (2021–2023), where he helped reach the 2022 European Challenge Cup final. After Bristol Bears (2020–2023), he joined Lyon OU in France's Top 14 for the 2023–2025 seasons. Internationally, Radradra debuted for Fiji in 2018 and featured in the 2019 Rugby World Cup, scoring key tries including against Wales; as of November 2025, he plays for Shizuoka Blue Revs in Japan Rugby League One after signing in June. Semi Ojeleye, born December 5, 1994, in Overland Park, Kansas, United States, is an American professional basketball forward of Nigerian descent, known for his defensive versatility and three-point shooting. After two seasons at Duke University (2013–2015), he transferred to Southern Methodist University (SMU), where he averaged 19.7 points and 8.6 rebounds per game in 2016–2017, earning American Athletic Conference Player of the Year honors. Selected 37th overall in the 2017 NBA Draft by the Boston Celtics, Ojeleye played four seasons there (2017–2021), appearing in 218 regular-season games with averages of 4.9 points and 2.7 rebounds. His overall NBA career averages across 284 games with the Celtics, Bucks, and Clippers were 3.4 points and 2.2 rebounds. After the Celtics, he played for the Milwaukee Bucks (2021–2022) and Los Angeles Clippers (2022), then moved overseas to Virtus Bologna in Italy's Lega Basket Serie A (2022–2023) and Valencia Basket in Spain's Liga ACB (2023–2025) before signing with Crvena Zvezda in June 2025; as of November 2025, he competes for Crvena Zvezda in Serbia's Adriatic League and EuroLeague. Semi Tadulala, born March 3, 1978, in , was a prolific winger celebrated for his speed and try-scoring prowess, amassing over 200 professional games before retiring around 2011. Starting with the in Australia's NRL (2000–2003), he recorded 35 tries in 64 matches before moving to England's with Wildcats (2004–2007) and (2008–2010), where he scored 37 tries in 52 games and helped the Bulls reach the 2008 . Representing internationally, Tadulala debuted in 2006 and played in the , contributing to their quarterfinal appearance with notable performances against and . Later switching to , he briefly appeared for (2010) and Carnegie (2010–2011), scoring 5 tries in limited outings before stepping away from elite play.

Other Notable Individuals Named Semi

Semi Joseph Begun (1905–1995) was a German-American inventor and entrepreneur renowned for his pioneering contributions to magnetic recording technology. Born in Danzig, Germany (now , ), Begun graduated from the in 1929 and emigrated to the in 1935, where he established a laboratory in , . He developed the first practical consumer , known as the Sound Mirror 800, issued on July 21, 1936 (U.S. Patent Nos. 2,048,487 and 2,048,488), which utilized steel tape and marked a significant advancement in audio recording for broadcasting and home use. His innovations laid foundational work for modern audio and video technologies, earning him induction into the in 1998. Lim Se-mi (born May 29, 1987) is a South Korean actress and model who has built a prominent career in entertainment and . She debuted in 2005 through the drama series , but gained widespread recognition with leading roles in popular series such as When the Weather Is Fine (2020) and (2023), the latter earning her acclaim for her portrayal of a complex character in a crime thriller. Active on platforms like , where she shares fashion and lifestyle content, Lim has cultivated a large following, contributing to her status as a multifaceted influencer in the K-entertainment industry. Semi Jaupaj is an singer who rose to prominence in the entertainment scene through . She first captured public attention as a participant on , which propelled her into the spotlight and led to her emergence as one of the country's popular vocalists by the early 2020s. Her career highlights the vibrant landscape in , where she has focused on mainstream releases appealing to younger audiences. The name is relatively rare, particularly in Western contexts, with U.S. data indicating fewer than five births per year on average since 1880, totaling an estimated 121 individuals named Semi to date. It often serves as a shortened form or in cultures such as (derived from names like Semir) and Pacific Islander communities (related to variants like Semisi, meaning "" in Tongan), reflecting its use as a concise, modern across diverse ethnic backgrounds.

Other Uses

In Transportation

A semi-trailer is a type of freight trailer supported at its forward end by the fifth wheel device on a truck tractor, lacking a front axle and relying on the tractor for propulsion and steering. This configuration became common in the United States during the 1920s, following early innovations like the 1914 semi-trailer developed by August Fruehauf, which allowed for more efficient long-haul transport compared to full trailers. In the U.S., operating a requires a (CDL) Class A, applicable to any of vehicles with a gross weight rating of 26,001 pounds or more, where the towed vehicle exceeds 10,000 pounds gross vehicle weight rating. The historical development of semi-trailers traces back to the late , with the first invented in 1898 by Alexander Winton to transport automobiles without adding mileage to them. By the early , designs evolved from basic wagon-like attachments to standardized tractor-trailer units in the 1920s, incorporating six-cylinder engines, power-assisted brakes, and improved aerodynamics during the post-World War II era. Advancements continued into the late with , GPS tracking, and electronic stability systems, and by 2025, semi-trucks feature autonomous capabilities under testing, such as Level 4 systems from companies like and Robotics, enabling driverless operation on dedicated routes in states like and . Semi-trucks, including those with semi-trailers, handle approximately 72% of U.S. freight by value, transporting over 10 trillion dollars in goods annually and supporting economic growth through efficient logistics. This dominance underscores their economic impact, as disruptions in trucking can ripple across supply chains, while the shift toward electrification addresses environmental concerns, with battery-electric models projected to reduce health and climate damages by billions annually compared to diesel counterparts. A prominent example is the Tesla Semi, unveiled in 2017 and entering production in late 2022 with initial deliveries to PepsiCo. It offers a 500-mile range on a single charge and accelerates from 0 to 60 mph in 20 seconds when fully loaded at 82,000 pounds, powered by advanced 4680 battery cells for higher energy density. By 2025, updates include a redesigned chassis, improved aerodynamics, and enhanced battery technology for a 500-mile range, with fleet adoption expanding through PepsiCo's ongoing deployments in California.

In Technology and Computing

In technology and computing, "semi" most prominently refers to semiconductors, which are materials exhibiting electrical conductivity between that of conductors and insulators, enabling precise control over electron flow essential for modern electronics. Silicon, the most widely used semiconductor material due to its abundance and suitable properties, forms the foundation for integrated circuits and devices. These materials revolutionized computing by replacing bulky vacuum tubes, leading to the miniaturization and increased efficiency of electronic systems. The pivotal development in semiconductor technology occurred in 1947 when and Walter Brattain demonstrated the first using at Bell Laboratories, with soon developing the more practical junction transistor. This invention, for which the trio received the 1956 , marked the birth of semiconductor-based electronics and laid the groundwork for the digital age. At their core, semiconductors operate on principles involving the band gap—the energy difference between the valence band (where s are bound) and the conduction band (where they can move freely)—which in intrinsic semiconductors like pure is about 1.1 volts at , allowing to vary with temperature, light, or . Doping introduces impurities to tailor : n-type doping adds donor atoms (e.g., in ) that provide extra s, while p-type doping adds acceptor atoms (e.g., ) that create "holes" or positive charge carriers, enabling the formation of p-n junctions critical for diodes and transistors. Semiconductors power key computing applications, including central processing units (CPUs) that execute instructions and memory chips like DRAM and NAND flash that store data temporarily or persistently. For instance, modern CPUs integrate billions of transistors on a single chip, enabling high-performance computing in devices from smartphones to supercomputers. As of 2025, industry trends focus on advancing to 2-nanometer process nodes, with TSMC's N2 technology featuring nanosheet transistors for improved power efficiency and density, having entered risk production in late 2024 and high-volume manufacturing in the second half of 2025; Intel's equivalent 18A process began mass production in October 2025, targeting high-performance applications. Beyond hardware, "semi" appears in computing syntax and . The (;) serves as a in many programming languages, separating sequential instructions to clarify code structure and prevent ambiguity in . This convention originated in , where it was adopted as a flexible separator to allow multiple statements per line or structured blocks, influencing descendants like , , and . In data processing, semi-structured data refers to information that lacks the rigid schema of relational databases but includes tags or markers for organization, facilitating flexible querying and storage. Formats like XML (Extensible ) exemplify this, using hierarchical tags to represent data such as documents or web configurations, enabling integration across diverse systems without predefined tables. This approach supports applications in analytics and databases, balancing structure with adaptability.

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