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Colour guard
Colour guard: a military detail that carries and defends a unit's flags (colours), and, in the United States, a performing-arts activity of flag and rifle spinning governed by Winter Guard International.
Colour revolution
A color revolution, also called a colored revolution, is a term for protest movements in post-communist states where disputed elections triggered mass demonstrations, such as Georgia's Rose Revolution in 2003.
Colour wheel theory of love
Colour wheel theory of love: John Alan Lee's 1973 typology of six love styles, primary eros, ludus, storge and secondary mania, pragma, agape, measured by the Love Attitudes Scale.
Coloureds
Coloureds (Bruinmense, Kleurlinge) are a multiracial population group in South Africa, emerging in the late nineteenth century at the Cape and formalized by the 1950 Population Registration Act.
Colt clan incest case
The Colt clan incest case: an Australian family, pseudonym "Colt", found in 2012 in rural New South Wales practicing four generations of incest; 12 children removed, 11 with related parents, followed by criminal prosecutions from 2014.
Colton Harris Moore
Colton Harris Moore, the Barefoot Bandit, American fugitive from Camano Island, Washington; escaped juvenile custody April 2008, suspected of nearly 100 thefts including stolen planes he flew without training, captured in the Bahamas July 2010, sentenced 2012.
Colton Smith (proprietary trader)
Colton David Smith is a proprietary trader and Head of Trading at Belvedere Trading, a Chicago options and derivatives market maker he joined as a trainee in 2012.
Coluccio Salutati
Coluccio Salutati (1331–1406) was an Italian humanist, notary, and politician who served as chancellor of the Florentine Republic from 1374 until his death, becoming the leading figure of Italian humanism after Petrarch through his Latin letters.
Columba
Columba, known in Irish as Colum Cille, was an Irish abbot of royal descent who founded the monastery of Iona around 563 and died there in 597.
Columba Bush
Columba Bush (Columba Garnica Gallo Bush), born 1953 in León, Mexico, is Jeb Bush's wife and Florida's first Hispanic first lady (1999-2007), known for low-profile advocacy on domestic violence, substance abuse, and the arts.
Columba López Gutiérrez
Columba Jazmín López Gutiérrez is a Mexican politician and agronomic engineer who became Secretary of Agriculture and Rural Development in 2026, the first woman to hold the office.
Columbanus
Columbanus, also known as Saint Columban, was an Irish missionary monk who founded the monasteries of Luxeuil in Burgundy and Bobbio in Lombardy, spreading Irish monasticism across the Continent.
Columbia Bank
Columbia Bank is the banking brand of Columbia Banking System, a Tacoma, Washington holding company renamed from Umpqua Bank in 2025 after its 2023 merger with Umpqua Holdings.
Columbia Business School
Columbia Business School (CBS), founded 1916, is Columbia University's graduate business school in New York City, an M7 member offering MBA, MS, PhD, and Executive Education programs, with 2,468 students, 149 faculty, and a Manhattanville campus opened in 2022.
Columbia College Chicago
Columbia College Chicago, founded in 1890 as the Columbia School of Oratory, is a private college in downtown Chicago's South Loop offering programs in the creative and media arts, liberal arts, and business.
Columbia College, Columbia University
Columbia College is the oldest undergraduate college of Columbia University, founded in 1754 as King's College by royal charter of George II, renamed Columbia College in 1784, home of the Core Curriculum launched in 1919, coeducational since 1983, with a 4.9% Fall 2025 acceptance rate.
Columbia Correctional Institution (Wisconsin)
Columbia Correctional Institution (CCI), a maximum-security Wisconsin state prison for adult male felons in Portage, opened May 14, 1986 on 110 acres with ten 50-cell units and a 150-bed minimum unit.
Columbia High School (New Jersey)
Columbia High School (New Jersey) is the public 9-12 high school of South Orange and Maplewood, called New Jersey's first public high school, with about 1,985 students, 31 AP courses, and 1968 Ultimate Frisbee origins.
Columbia Human Rights Law Review
Columbia Human Rights Law Review (HRLR), formerly Columbia Survey of Human Rights Law, is Columbia Law School's student-edited human rights journal, publishing since 1968, open access since 2019, with HRLR Online and A Jailhouse Lawyer's Manual.
Columbia Law School
Columbia Law School, founded 1858 in New York City, is Columbia University's law school. Distinguished by the Lieber Code, the Dwight Method, Ruth Bader Ginsburg, high tuition, and strong large-firm placement.
Columbia Threadneedle
Columbia Threadneedle Investments is the global asset management brand of Ameriprise Financial, formed in 2015 by combining Boston-based Columbia Management with London-based Threadneedle, managing about $715 billion.
Columbia University
Columbia University, founded in 1754 as King's College, is a private research university in New York City. It is the oldest institution of higher education in New York.
Columbia University Irving Medical Center
Columbia University Irving Medical Center (CUIMC) is Columbia University's health sciences campus in Washington Heights, Manhattan, housing four professional schools and partnering with NewYork-Presbyterian Hospital, opened in 1928.
Columbia University Press
Columbia University Press is the publishing house of Columbia University in New York City, founded in 1893 and publishing about 200 new titles a year.
Columbia University School of General Studies
Columbia University School of General Studies (GS), founded July 1, 1947 from University Extension, is Columbia's undergraduate college for nontraditional students, veterans, and dual-degree seekers, granting the same BA as Columbia College.
Columbia University's settlement with the Trump administration
Columbia University's July 23, 2025 settlement with the Trump administration resolved federal anti-discrimination investigations with $221 million in payments, a compliance monitor, and restored research funding.
Columbia-class submarine
Columbia-class (SSBN-826 class): 12 US Navy ballistic missile submarines replacing 14 Ohio-class SSBNs, Navy's top priority; lead boat USS District of Columbia, 16 Trident tubes, life-of-ship reactor, 42-year life, delivery delayed to 2028-2029.
Columbine effect
The Columbine effect: how the 1999 Columbine High School massacre (13 killed) became a blueprint for later school shooters, spawned Columbiner and True Crime online subcultures, and drove lockdown drills and school security changes.
Columbine High School
Columbine High School (CHS), a Jeffco Public Schools high school near Littleton, Colorado, opened 1973, ~1,700 students, Rebels mascot; site of the April 20, 1999 shooting that killed 13.
Columbine High School massacre
The Columbine High School massacre, April 20, 1999, near Littleton, Colorado: students Eric Harris and Dylan Klebold killed 13 people in a failed bombing-and-shooting attack, the worst U.S. school shooting until Parkland in 2018.