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2,220 words — headwords with part of speech, pronunciation, and a plain-language definition.

O
noun
abbreviation of oeste; west
O'Higgins
proper noun
O'Higgins (a region of Chile); a province of Chile until 1976.
O'Ward
proper noun
O'Ward: a surname from Irish
OA
proper noun
abbreviation of Oaxaca: a state of Mexico
OC
proper noun
abbreviation of Oaxaca
OCA
proper noun
acronym of Organización Coordinadora Argentina, a private postal service in Argentina
OCI
proper noun
initialism of Organización para la Cooperación Islámica (“Organization for Islamic Cooperation”): OIC
OEA
proper noun
initialism of Organización de los Estados Americanos (“OAS”)
OGM
noun, masculine
GMO
OHI
proper noun
initialism of Organización Hidrográfica Internacional (“International Hydrographic Organization”): IHO
OK
adjective
OK
OK
interjection
OK
OLP
proper noun
initialism of Organización para la Liberación de Palestina (“Palestine Liberation Organization”): PLO
OMC
proper noun
initialism of Organización Mundial de Comercio (“WTO, World Trade Organization”); initialism of Orden del Mérito Civil Post-nominal letters used by Knights and Dames of the Order of Civil Merit.
OMI
proper noun
initialism of Organización Marítima Internacional (IMO (International Maritime Organization))
OMM
proper noun
WMO (World Meteorological Organization)
OMPI
proper noun
acronym of Organización Mundial de la Propiedad Intelectual (“WIPO”)
OMS
proper noun
initialism of Organización Mundial de la Salud (“WHO”)
OMT
proper noun
initialism of Organización Mundial de Turismo (“UNWTO”)
ONG
noun, feminine
NGO (non-governmental organisation)
ONT
proper noun
abbreviation of Organización Nacional de Transplantes
ONU
proper noun
acronym of Organización de las Naciones Unidas (“United Nations Organization”): UN
OPEP
proper noun
OPEC; acronym of Organización de Países Exportadores de Petróleo
OTAN
proper noun
acronym of Organización del Tratado del Atlántico Norte: NATO
OTSC
proper noun
initialism of Organización del Tratado de Seguridad Colectiva (“Collective Security Treaty Organisation”): CSTO
OVD
proper noun
abbreviation of Oviedo
Oaxaca
proper noun
Oaxaca (a city in Mexico); Oaxaca (a municipality of Mexico); Oaxaca (a state of Mexico)
Full name of Oaxaca
Oaxtepec
proper noun
Oaxtepec (a town in Yautepec, Morelos, Mexico).
Obadías
proper noun
Obadiah
Obama
proper noun
a surname in English; a surname of Equatorial Guinean usage
Oberón
proper noun
Oberon
Obispo
proper noun
a surname
Obrador
proper noun
a surname
Obregón
proper noun
a surname
Oc
interjection
K., OK
Ocampo
proper noun
a surname from Galician
Ocasio
proper noun
a surname
Ocaña
proper noun
a town, a municipality of Toledo, Castilla-La Mancha, Spain
Ocaña
proper noun
a surname transferred from the place name originating from Castilla-La Mancha
Occitania
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)
Oceanía
proper noun
Oceania (a continent or continental region composed of Australia, New Zealand and the islands of Melanesia, Micronesia and Polynesia)
Ochoa
proper noun
a surname from Basque
Ocon
proper noun
a surname, Ocon
Ocotepec
proper noun
Ocotepec
Ocotepeque
proper noun
Ocotepeque (a city in Honduras); Ocotepeque (a department of Honduras)
Ocros
proper noun
a province of Peru
Octava Región
proper noun
alternative spelling of VIII Región
Octavio
proper noun
a male given name from Latin
Odesa
proper noun
Odessa (a city in Ukraine)
Odiel
proper noun
a river in Huelva, Andalusia, Spain
Odilón
proper noun
a male given name
Odisea
proper noun
Odyssey
Odiseo
proper noun
Odysseus
Odría
proper noun
a surname from Basque
Odín
proper noun
Odin
Oeste
proper noun
Oeste Subregion
Ofelia
proper noun
a female given name, equivalent to English Ophelia
Ofiuco
proper noun
Ophiuchus
Ofión
noun, masculine
Ophion