6,078 articles
Occupy Wall Street
Occupy Wall Street (OWS) was a leaderless protest movement begun September 17, 2011 in Zuccotti Park, New York, called by Adbusters, protesting inequality as the 99 percent; it spread to hundreds of sites, shifted political discourse, and collapsed by 2012.
Oda clan (織田氏)
The Oda clan, also known as the Oda family (織田氏, Oda-shi), was a Japanese samurai family that rose from deputy governors of Owari Province and produced the unifier Oda Nobunaga.
Odawa
The Odawa, also spelled Ottawa and called Odaawaa in Anishinaabemowin, are an Indigenous people of the northern Great Lakes, known as fur-trade middlemen and for Pontiac's War of 1763.
Odd Fellows
The Odd Fellows are fraternal orders and friendly societies originating in 18th-century England among workers of assorted trades, named 'odd' for lacking guild membership. Main bodies: the IOOF (Baltimore, 1819, founded by Thomas Wildey) and Manchester Unity (1810), motto Friendship, Love and Truth.
Oddball paradigm
The oddball paradigm is an experimental design in cognitive psychology and neuroscience in which rare deviant stimuli among frequent standards elicit the P300, a measure of attention and stimulus evaluation.
Oddball task
The oddball task is an experimental paradigm in which participants detect rare target stimuli among frequent standards, reliably eliciting the P300, a brain response used as a biomarker of cognitive function.
Oedipus complex
Oedipus complex: Freud's psychoanalytic concept of a child's sexual and aggressive impulses toward its parents, discovered through his 1897 self-analysis, named in 1910, and debated by anthropologists, feminists, and empirical reviewers.
Ohlone
Ohlone (Costanoan): Indigenous peoples of the San Francisco Bay Area and central California coast, organized as about fifty autonomous village polities speaking eight related languages; missionized from 1769, declared extinct by Kroeber in 1925, but persisting today in tribes such as the Muwekma Ohlone.
Oirats
Oirats (Oyirad), western Mongolic peoples of Mongolia, Xinjiang, Qinghai, and Kalmykia; Dörbön Oyirat confederation, Dzungar Khanate, 1640 code, 1771 Torghut return, todo bichig Clear Script.
Ojibwe
The Ojibwe, self-named Anishinaabeg and also called Chippewa, are an Algonquian-speaking Indigenous people of the Great Lakes, closely related to the Odawa and Potawatomi, with about 200,000 people in the United States and Canada.
Okie
Okie: 1930s California slur, short for Oklahoma, for poor Dust Bowl-era migrants from Arkansas, Missouri, Oklahoma, and Texas; later reclaimed as a badge of Oklahoman pride.
Okun people
The Okun people are a Yoruba-speaking subgroup of northeastern Yorubaland near the Niger–Benue confluence, mainly in western Kogi State, Nigeria, comprising the Owe, Oworo, Ijumu, Bunu, and Yagba groups.
Olave Baden-Powell, Baroness Baden-Powell
Olave Baden-Powell, Baroness Baden-Powell, born Olave St Clair Soames, led the world Girl Guide movement, serving as UK Chief Guide from 1918 and World Chief Guide from 1930.
Old Catholic Church
Old Catholic Church: national churches, chiefly the Union of Utrecht (founded 1889), that left Rome after Vatican I's 1870 infallibility dogma, keep apostolic succession, and hold full communion with the Anglican Communion since the 1931 Bonn Agreement.
Old Glory
Old Glory is the American flag Captain William Driver of Salem, Massachusetts, named in 1824; hidden in a quilt in Nashville during the Civil War and raised over the city in 1862, it is now in the Smithsonian and the nickname applies to all U.S. flags.
Old Prussians
The Old Prussians, also known as Baltic Prussians, were Baltic peoples living between the Vistula and Neman rivers, extinct as a distinct group by the seventeenth century.
Olive Morris
Olive Elaine Morris (1952–1979), Jamaican-born British activist in Brixton; British Black Panthers member, co-founder of the Brixton Black Women's Group and OWAAD, squatter at 121 Railton Road, died of non-Hodgkin lymphoma at 27.
Olive Oatman
Olive Ann Oatman (1837–1903), American Indian captive and lecturer; survivor of the 1851 Oatman massacre on the Gila River, held by Yavapai and Mohave for five years, tattooed, ransomed at Fort Yuma in 1856, subject of Stratton's Captivity of the Oatman Girls.
Olive theory
Olive theory: a TikTok-viral compatibility idea from the How I Met Your Mother pilot, claiming a couple works when one loves and one hates olives; unscientific, with a sacrifice-based twist.
Olivia Grosvenor, Duchess of Westminster
Olivia Grosvenor, Duchess of Westminster (nee Olivia Henson) is the wife of Hugh Grosvenor, 7th Duke of Westminster, married 7 June 2024 at Chester Cathedral; Trinity College Dublin graduate, former Belazu account manager, mother of Lady Cosima (born 2025).
Olivia Maurel
Olivia Maurel (born 1991) is a French-American anti-surrogacy activist born via traditional surrogacy in Kentucky, USA; spokesperson of the Casablanca Declaration and author of ¿Dónde estás, mamá?
Olivia Palermo
Olivia Palermo (born 1986) is an American fashion entrepreneur and former reality-TV personality from Manhattan, known for MTV's The City (2008–2010), her oliviapalermo.com website founded in 2011, and the Olivia Palermo Group lifestyle company established in 2018.
Omega Psi Phi
Omega Psi Phi Fraternity, Inc., a historically Black fraternity and Divine Nine member founded November 17, 1911 at Howard University by Love, Cooper, Coleman, and Just, with motto 'friendship is essential to the soul.'
Omladina
Omladina (Serbian and Czech for "youth") refers to the United Serbian Youth founded in 1866 and a Czech radical youth movement tried in Prague in 1893–1894.
Omnisexuality
Omnisexuality (omnisexualité) is a multisexual orientation defined by attraction to people of all genders, with gender playing a role in attraction, distinguishing it from gender-blind pansexuality; first recorded in 1959.
On-again, off-again relationship
On-again, off-again relationship (relationship cycling, churning): a romantic relationship in which the same partners break up and renew at least once. About two-thirds of adults experience one; cycling correlates with relational stress, depression, and anxiety.
One Million Dollar Paranormal Challenge
The One Million Dollar Paranormal Challenge, also called the James Randi Million Dollar Challenge, was a JREF prize for demonstrating paranormal ability under controlled conditions; over 1,000 applied, none passed, and it ended in 2015.
One-child policy
One-child policy (独生子女政策): China's fertility restriction from 1979 to the end of 2015, enforced via fines and quotas, ended by the universal two-child policy on 1 January 2016, leaving ~90 million only children and lasting low-fertility effects.
One-drop rule
One-drop rule: American hypodescent principle classifying anyone with any known African ancestry as Black; codified in Virginia's 1924 Racial Integrity Act and 1930 amendment, enforced by registrar Walter Plecker, struck down by Loving v. Virginia (1967).
Oneida people
The Oneida (Onyota'a:ká:, People of the Standing Stone) are a founding nation of the Haudenosaunee Confederacy from central New York, American allies in the Revolution, now in New York, Wisconsin, and Ontario.