All articles starting with O
9,097 articles
Ontario Ministry of Health
The Ontario Ministry of Health is the Ontario government department responsible for the province's publicly funded health-care system, managing OHIP, drug programs, and emergency health services.
Ontario Municipal Board
The Ontario Municipal Board (OMB), originally the Ontario Railway and Municipal Board, was Ontario's quasi-judicial tribunal for municipal planning appeals until its 2018 replacement by the LPAT, later merged into the Ontario Land Tribunal.
Ontario Municipal Employees Retirement System (OMERS)
OMERS is a jointly sponsored defined-benefit pension plan created in 1962 for Ontario municipal and broader-public-sector employees, with 665,000 members and $145.2 billion in net assets.
Ontario New Democratic Party
Ontario New Democratic Party (Nouveau Parti démocratique de l'Ontario): provincial wing of Canada's federal NDP, organizationally integrated with it. Led by Marit Stiles since 2023, current Official Opposition with 25 seats; governed once under Bob Rae, 1990–1995.
Ontario Power Generation
Ontario Power Generation (OPG) is the Province of Ontario's largest electricity generator, created in 1999 from Ontario Hydro, operating nuclear, hydroelectric, and gas stations including Darlington and Pickering.
Ontario Premier League
Ontario Premier League (OPL), formerly League1 Ontario, Ontario's pro-am senior soccer league founded 2014, renamed January 2026 under PSLC; three tiers OPL 1-3 with promotion/relegation, owned by Canadian Soccer Business.
Ontario Provincial Police
The Ontario Provincial Police (OPP) is the provincial police service of Ontario, Canada. Established in 1909, it polices municipalities without their own forces and patrols provincial highways.
Ontario Securities Commission
The Ontario Securities Commission (OSC) administers and enforces Ontario's Securities Act and Commodity Futures Act, regulating public companies and investment funds while being self-funded through industry fees.
Ontario Teachers' Pension Plan
Ontario Teachers' Pension Plan is a Canadian defined-benefit pension plan for Ontario's teachers, co-sponsored by the Ontario government and the Ontario Teachers' Federation, with $279.4 billion in net assets.
Ontario Tower Buzzers
Ontario Tower Buzzers: Single-A California League baseball team in Ontario, California, Los Angeles Dodgers affiliate debuting 2026 at ONT Field, aviation- and Top Gun-themed, successor to the Rancho Cucamonga Quakes franchise rights.
Ontario, California
Ontario, California: Inland Empire city in San Bernardino County founded 1882 by the Chaffey brothers as the Model Colony, incorporated 1891; population about 187,000, home to Ontario International Airport.
OnTheMarket
OnTheMarket is a British residential property portal founded by estate agents in 2013 as a rival to Rightmove and Zoopla, and owned by CoStar Group since 2023.
Ontic Technologies
Ontic Technologies, formally Ontic Engineering & Manufacturing, is a British aerospace company that takes over manufacture of mature aircraft parts other makers no longer produce.
Onto (company)
Onto was a British electric-car subscription startup based in Warwickshire, England, founded by Rob Jolly and Dannan O'Meachair, which raised over $350 million before entering administration in September 2023.
Ontogenesis
Ontogenesis (ontogeny): the development of an individual organism from earliest stage to maturity, contrasted with phylogenesis; rooted in Haeckel's recapitulation law, now studied as developmental biology with evolutionary constraints.
Ontogeny
Ontogeny is an individual organism's development from fertilization to maturity. Known through Haeckel's biogenetic law "ontogeny recapitulates phylogeny" (1866), rejected in strict form but surviving as a partial trend studied in evo-devo.
Ontological argument
Ontological argument: a priori argument for God's existence, first by Anselm of Canterbury (Proslogion, 1078), later by Descartes, Leibniz, Malcolm, Hartshorne, Plantinga, and Gödel; criticized by Gaunilo and Kant (existence not a predicate).
Ontology
Ontology is the branch of philosophy that studies what exists and the general features of existing entities. It is a division of metaphysics that asks how things are categorized.
Ontology (information science)
In information science, an ontology is a formal, machine-readable vocabulary of terms for a domain, standardized in the W3C Web Ontology Language (OWL), part of the Semantic Web.
Ontology alignment
Ontology alignment is a knowledge engineering method that finds correspondences between semantically related entities of two ontologies, so data described with different vocabularies can be interpreted together.
Ontology learning
Ontology learning is a family of semi-automatic methods that extract concepts, relations, and axioms from text or data to build ontologies, first framed by Maedche and Staab in 2001.
Ontology mapping
Ontology mapping, also called ontology matching or alignment, is a knowledge-representation method that finds correspondences between entities of different ontologies so data described with one vocabulary can be interpreted with another.
Ontong Java Plateau
Ontong Java Plateau, largest oceanic plateau on Earth, western Pacific near Solomon Islands; formed ~120 Ma, area over 1.5 million km2, 30-35 km crust, submarine tholeiitic basalts, origin debated between thermochemical plume, spreading, and impact.
Ontos (video game)
Ontos (ONTOS) is an upcoming 2027 sci-fi mystery immersive sim by Frictional Games, spiritual successor to Soma, set on the moon hotel Samsara; player character Aditi Amani, Stellan Skarsgård in cast, published with Kepler Interactive.
Onuba
Onuba, known in Latin as Onoba Aestuaria, was an ancient settlement beneath modern Huelva, Spain, with a Phoenician quarter from about 900 BC and the earliest-known iron and silver metalworking in Iberia.
Onufri
Onufri was a sixteenth-century Albanian icon painter, active from at least 1547 to 1554, regarded as the greatest Albanian painter of his century and founder of the Berat school of icon painting.
Onufriy Berezovsky
Onufriy Berezovsky, also known as Metropolitan Onufriy, is the Ukrainian Orthodox bishop and Primate of the UOC. He led the church through a schism with the Moscow Patriarchate since 2018.
Onuka
Onuka is a Ukrainian electro-folk band founded in Kyiv in 2013 by singer Nata Zhyzhchenko and composer Yevhen Filatov, whose Eurovision 2017 interval act carried the Vidlik EP into UK and German charts.
Onur Boyman
Onur Boyman is a Swiss physician-scientist and professor of clinical immunology at the University of Zurich, known for cytokine immunotherapy and Long Covid complement research.
Onur Tuna
Onur Tuna, Turkish actor and musician born 1985 in Canakkale; known for Filinta, Yasak Elma, Mucize Doktor, and Mahkum, and for his EP Uzay Misali.