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

opéra-comique
noun, masculine
opéra comique
opéra-féerie
noun, masculine
fairy opera
opérable
adjective
operable
opérande
noun, masculine
operand (quantity to which an operator is applied)
opérant
adjective
operant
opérateur
noun, masculine
operator (someone who operates); operator
opératif
adjective
operative
opération
noun, feminine
operation (method by which a device performs its function); operation (medical operation)
day-to-day operation; operating activities
divine intervention, miracle
special military operation (military campaign resembling a war; especially the 2022 Russian invasion of Ukraine)
opérationnel
adjective
operational (all meanings)
operationally
opérationnisme
noun, masculine
operationism
opératique
adjective
operatic
operatically
opératoire
adjective
operative; surgical
operatively; surgically
opéraïsme
noun, masculine
workerism
opéraïste
noun, masculine/feminine
workerist
opéraïste
adjective
workerist
to operate (on); to take place
opérette
noun, feminine
operetta, light opera
oque
noun, feminine
an oka: any of various units of mass formerly used in Turkey, Greece, and Egypt, all being approximately 1+¹⁄₄ kilograms (2+³⁄₄ pounds)
or
conjunction
yet, however, now, that said, as it happens (introduces the second term in a syllogism)
or
adverb
now, presently
or
noun, masculine
gold; or (yellow in heraldry)
or blanc
noun, masculine
white gold (alloy of gold and another precious metal)
or massif
noun, masculine
solid gold
or mussif
noun, masculine
mosaic gold
or noir
noun, masculine
black gold, petroleum
oracle
noun, masculine
oracle
oraculaire
adjective
oracular
orage
noun, masculine
thunderstorm; storm, upset; turmoil, tumult; a device on an organ, which produces a "thunder" effect, usually by playing a large cluster chord on the pedalboard
stormily
orageux
adjective
stormy (weather); stormy, tumultuous (a situation)
oraison
noun, feminine
oration; orison, meditative prayer
oral
adjective
oral
oral
noun, masculine
an oral exam, a viva, a viva voce
oralement
adverb
orally
oralisation
noun, feminine
oralization/oralisation
to oralize/oralise
oralité
noun, feminine
orality, the spoken word
oranais
adjective
of Oran; Oranese
orang-outan
noun, masculine
orangutan (arboreal anthropoid ape)
orang-outang
noun, masculine
orangutan
orange
adjective
orange (orange-coloured)
orange
noun, feminine
orange (fruit)
orange
noun, masculine
orange (colour)
orange amère
noun, feminine
bitter orange
orange sanguine
noun, feminine
blood orange (Citrus sinensis)
orangeade
noun, feminine
orangeade
orangeat
noun, masculine
orangeat
oranger
noun, masculine
orange tree
to make orange in color
orangeraie
noun, feminine
orange tree orchard, orangery (garden or plantation where orange trees are grown)
orangerie
noun, feminine
orangery
orangette
noun, feminine
orangette (confection)
orangiste
adjective
Orangeism
orangiste
noun, masculine/feminine
Orangeman