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Obcecar	Obcecar	Obséder	To blind, To obscure, To confuse, To obsess
Obedecer	Obedecer, Cumplir, Observar	Obéir	To obey
Objetar	Objetar, Refutar	Objecter	To object, To oppose
Objetivar	Objetivar	Objectiver	To aim at
Obrigar	Obligar, Coaccionar, Imponer	(S´) obliger; (S´) imposer	To oblige, To force, To compel
Obscurecer	Obscurecer, Oscurecer, Ofuscar	(S´) obscurcir; (S´) assombrir	To (become) obscure
Observar	Observar, Ver, Percibir, Notar, Cumplir	Observer	To observe, To watch
Obstruir	Obstruir, Atascar, Impedir, Obturar, Ocluir	Obstruer; Oblitérer; Barrer; Boucher; Emcombrer; Engorger	To obstruct, To block up
Obter	Obtener, Adquirir, Lograr	Obtenir	To obtain, To gain, To achieve, To get, To attain, To acquire, To purchase
Obturar	Obturar, Tapar, Entupir, Empastar (dente)r	Obturer	To obturate, To fill (dente)
Ocasionar	Ocasionar, Aportar	Occasionner; Causer; Donner lieu	To cause
Ocorrer	Ocurrir, Acaecer, Acontecer, Suceder	Arriver; Se produire; Succéder	To occur, To happen
Ocultar	Ocultar, Agachar, (en)Cubrir, tapar, velar	Occulter (Se) cacher	To occult, To hide, To conceal
Ocupar	Ocupar, cundir, Emplear	(S´) occuper; Envahir	To occupy
Odiar	Odiar, Execrar, Detestar	(Se) haïr; Détester	To hate, To detest, To dislike, To abhor
Ofegar	Jadear	Haleter	To pant, To puff
Ofender	Ofender, Afrentar, Injuriar, Insultar	(S´) offenser; (Se) vexer; Outrager; Injurier; Se flâcher; Se froisser	To offend, To insult, To hurt
Oferecer	Ofrecer, Ofertar, Ofrendar, Brindar	(S´) offrir; Donner	To offer, To give
Oficializar	Oficializar	Officialiser	To officialize
Ofuscar	Ofuscar, Obnubilar, Obscurecer	Offusquer	To obfuscate, To obscure, To dazzle, To confuse
Olhar	Mirar, contemplar, Examinar, Observar	Regarder; Contempler; Examiner	To look, To stare at, To gaze, To protect, To observe, To face (no espelho)
Omitir	Omitir, Abstraer	Omettre	To omit, to neglect
Ondular	Ondular, Ondear	Onduler; Friser; Ondoyer	To wave, To undulate
Onerar	Onerar	Charger; Surcharger	To burden, To tax
Operar	Operar	Opérer; Agir; Exécuter; Réaliser	To produce, To operate on (operar-se)
Opinar	Opinar, Juzgar	Opiner	To judge, To opine
Opor	Oponer, contraponer, Enfrentar, Objetar, Recusar	(S´) opposer	To oppose, To object
Oprimir	Oprimir, sojuzgar, Tiranizar, Abrumar, Acongojar	Oppresser	To oppress
Optar	Optar, Escojer, Eligir, Preferir	Choisir	To opt, To choose, To make a choise
Orar	Orar, rezar	prier	To pray
Ordenar	Ordenar, decretar, Establecer, Estatuir, Mandar, Organizar	Ordonner; Arranger; Ranger; Disposer; Prescrire	To order, To arrange, To organize
Ordenhar	Ordeñar	Traire	To milk
Organizar	Organizar, Allanar, Programar, Estructurar	(S´) organiser	To organize
Orgulhar	Enorgullecer, Envaidecerse, Ufanarse, Vanagloriarse	(S´) enorgueillir	To be proud (of), To become boastful
Orientar	Orientar, conducir, Disciplinar, Guiar, Instruir	(S´) orienter	To orientate, To guide, To direct
Originar	Originar, Criar	Entraîner; Provoquer	To originate, To cause, To rise, To start, To descend, To derive (from)
Ornamentar	Ornamentar, Adornar, Engalanar	Orner; Ornementer	To ornament, To adorn
Ornar	Ornar, Adornar, Guarnecer	(S´) orner	To adorn, To decorate, To attire, To embellish, To garnish
Orquestrar	Orquestrar, Instrumentar	Orchestrer	To orchestrate
Oscilar	Oscilar, Blandir, Fluctuar, Tambalearse	Osciller	To oscillate, To vacillate
Ostentar	Ostentar, Exhibir, Pavonear	Témoigner de l´ostentation; Faire ou montrer avec ostentation	To exhibit, To display
Ousar	Osar, Atreverse, Emprender	Oser	To dare, To risk, To attempt
Ouvir	Oir, Escuchar	Entendre; Ouïr	To hear, To listen (to)
Ovacionar	Ovacionar, Aclamar, Aplaudir	Ovationner	To acclaim, To give a standing ovation to
Oxigenar	Oxigenar	Oxygéner	To oxygenate