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2,133 words — headwords with part of speech, pronunciation, and a plain-language definition.

O
noun, feminine
abbreviation of ouest; west
O'Bansawin
proper noun
a surname, O'Bansawin, from Abenaki; alternative form of Obonsawin
O'Keefe
proper noun
a surname, O'Keefe, from Irish
O. K.
interjection
alternative spelling of OK
OACI
proper noun
initialism of Organisation de l'aviation civile internationale (“International Civil Aviation Organization (ICAO)”)
OAS
proper noun
initialism of Organisation de l'Armée Secrète
OCI
proper noun
initialism of Organisation de la coopération islamique (“Organization for Islamic Cooperation”): OIC; initialism of Organisation communiste internationale (“International Communist Organization”), a former communist party in France. ICO
OEA
proper noun
initialism of Organisation des États américains (“OAS”)
OFPRA
proper noun
acronym of Office français de protection des réfugiés et apatrides (“French office for the protection of refugees and stateless persons”)
OGM
noun, masculine
initialism of organisme génétiquement modifié: GMO; (loosely) GM, GM crops
OHI
proper noun
initialism of Organisation hydrographique internationale (“International Hydrographic Organization”): IHO
OIF
proper noun
initialism of Organisation internationale de la francophonie (“Organisation internationale de la Francophonie”)
OIML
proper noun
initialism of Organisation internationale de métrologie légale
OIT
proper noun
initialism of Organisation internationale du travail (“International Labour Organization”); ILO
OK
interjection
OK (endorsement; approval)
OL
proper noun
initialism of Olympique Lyonnais (a soccer team from the French town of Lyons)
OLAF
proper noun
initialism of office européen de lutte antifraude (“European Anti-Fraud Office”)
OLP
proper noun
initialism of Organisation de libération de la Palestine (“Palestine Liberation Organization”): PLO
OM
proper noun
initialism of Olympique de Marseille, a football team from Marseille
OMC
proper noun
initialism of Organisation mondiale du commerce (“WTO, World Trade Organization”)
OMM
proper noun
WMO (World Meteorological Organization)
OMPI
proper noun
initialism of Organisation mondiale de la propriété intellectuelle (“WIPO”)
OMS
proper noun
initialism of Organisation Mondiale de la Santé WHO (World Health Organisation)
ONF
proper noun
initialism of Office national des forêts (“National Forests Office”)
ONG
noun, feminine
initialism of organisation non gouvernementale = NGO (non-governmental organisation)
ONU
proper noun
initialism of Organisation des Nations Unies = UNO; often used for UN (United Nations)
OODA
phrase
OODA (“Observe, Orient, Decide, Act”); initialism of observer, s'orienter, décider, et agir
OPA
noun, feminine
initialism of offre publique d'achat
OPEP
proper noun
OPEC; acronym of Organisation des pays exportateurs de pétrole
OQ
noun, feminine
initialism of officier de l'ordre national du Québec
OQLF
proper noun
initialism of Office québécois de la langue française: the Quebec Board of the French Language
OQTF
noun, feminine
initialism of obligation de quitter le territoire français (“obligation to leave France”)
ORL
adjective
abbreviation of otorhinolaryngologique (otolaryngological)
ORL
noun, feminine
abbreviation of otorhinolaryngologie: ENT (otolaryngology); abbreviation of otorhinolaryngologiste (otolaryngologist)
ORSEC
proper noun
initialism of organisation de la réponse de sécurité civile: French plans for dealing with disasters and emergencies, specifying the personnel, equipment, and techniques to be used
OTAN
proper noun
acronym of Organisation du traité de l'Atlantique Nord: NATO
OTSC
proper noun
initialism of Organisation du traité de sécurité collective (“Collective Security Treaty Organisation”): CSTO
OVNI
noun, masculine
alternative letter-case form of ovni
OZRT
proper noun
initialism of Office Zaïrois de Radiodiffusion et de Télévision (“Zairian Bureau of Broadcasting and Television”),a state public broadcaster of Zaire (now Democratic Republic of the Congo) from 1981 to 1997.
Oakland
proper noun
Oakland (a city in the United States)
Obbrussel
proper noun
Saint-Gilles (a municipality of Brussels, Belgium)
Obwald
proper noun
Obwalden (a canton of Switzerland)
Occident
proper noun
the West (Western world)
Occitan
noun, masculine
Occitan man
Occitane
noun, feminine
Occitan woman
Occitanie
proper noun
Occitania (a cultural region in southwestern Europe where Occitan has historically been spoken, consisting of southern France, parts of Catalonia in Spain, and some valleys in northwestern Italy); Occitania (an administrative region in southern France)
Och
proper noun
Osh (a city in Kyrgyzstan)
Ocon
proper noun
a surname, Ocon, from Spanish
Octavien
proper noun
a male given name from Latin, equivalent to English Octavian
Océan
proper noun
Oceanus (god)
Océane
proper noun
a female given name, popular in the 1990s and the 2000s
Océanide
noun, feminine
Oceanid
Océanie
proper noun
Oceania (a continent or continental region composed of Australia, New Zealand and the islands of Melanesia, Micronesia and Polynesia)
Océanne
proper noun
a female given name
Odebrecht
proper noun
a surname from German
Odette
proper noun
a female given name
Odile
proper noun
a female given name
Odin
proper noun
Odin (god)
Odjick
proper noun
Odjick: a surname from Algonquin
Odyssée
proper noun
the Odyssey (an Ancient Greek epic poem, ascribed to Homer, which depicts the journey of Odysseus back to Ithaca after the fall of Troy)