obtain
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B2 verb /əbˈteɪn/

obtain

obtenir
Meaning
to get or acquire something
Example
You need to obtain a visa before traveling abroad.
Vous devez obtenir un visa avant de partir à l'étranger.
B2 verb /ˌoʊvərˈteɪk/

overtake

doubler
Meaning
to catch up with and pass someone or something; to surpass
Example
The runner managed to overtake his competitor in the final lap.
Le coureur a réussi à doubler son concurrent lors du dernier tour.
B2 verb /ˌoʊvərˈiːt/

overeat

bonheur
Meaning
To eat more food than the body needs.
Example
She tends to overeat when she is stressed.
Elle ne pouvait pas cacher son bonheur quand elle a reçu le prix.
B1 adjective /ˌoʊvərˈweɪt/

overweight

surpoids
Meaning
heavier than is considered healthy or normal
Example
The doctor advised him to lose weight as he was overweight.
Le médecin lui a conseillé de perdre du poids car il était en surpoids.
B2 noun /ˈaʊt.saɪ.dər/

Out-sider

étranger
Meaning
a person who does not belong to a particular group; someone not accepted by a group
Example
As an outsider, he found it difficult to understand their traditions.
En tant qu'outsider, il a trouvé difficile de comprendre leurs traditions.
C2 verb /ˈoʊɡəl/

ogle

regarder avec désir
Meaning
To look at someone with obvious sexual interest.
Example
He kept ogling the models on the runway.
Il n'arrêtait pas de regarder les mannequins sur le podium.
C1 noun /ˈɑd.ɪ.ti/

Oddity

étrangeté
Meaning
something that is strange or unusual; a peculiar trait
Example
His habit of sleeping standing up was considered an oddity.
Son habitude de dormir debout était considérée comme une étrangeté.
C1 noun /ˈɔːrdɪnəns/

ordinance

ordonnance
Meaning
An authoritative rule, law, or decree issued by a city, town, or authority.
Example
The city council passed an ordinance banning smoking in public parks.
Le conseil municipal a adopté une ordonnance interdisant de fumer dans les parcs publics.
C1 verb ˈɔː.kɪ.streɪ.tɪd

orchestrated

orchestré
Meaning
Planned or coordinated carefully and deliberately.
Example
The attacks were orchestrated with precision.
Les attaques ont été orchestrées avec précision.
B2 noun /ˈɔɪ.stər/

Oyster

huître
Meaning
a type of shellfish that can be eaten and sometimes contains pearls
Example
She ordered fresh oysters at the seafood restaurant.
Elle a commandé des huîtres fraîches au restaurant de fruits de mer.
B2 noun /ˈɒkjʊpənt/

occupant

occupant
Meaning
A person who resides in or is present in a house, vehicle, seat, or place.
Example
The car had three occupants at the time of the accident.
La voiture avait trois occupants au moment de l'accident.
C1 noun /əbˈdʒɛktər/

objector

opposant
Meaning
a person who expresses opposition or disapproval to something
Example
The objector raised his concerns during the town meeting.
L'opposant a exprimé ses préoccupations lors de la réunion municipale.
C2 noun /ˌɔːrəˈtɔːri.oʊ/

oratorio

composition musicale religieuse
Meaning
A large-scale musical composition for orchestra, choir, and soloists, usually on a sacred theme, performed without costumes or scenery.
Example
Handel's 'Messiah' is one of the most famous oratorios ever written.
Le 'Messie' de Handel est l'un des oratorios les plus célèbres jamais écrits.
B1 verb /ˈɒpəreɪtɪŋ/

operating

opérant
Meaning
to control or manage the functioning of something
Example
The company has been operating in this market for five years.
L'entreprise opère sur ce marché depuis cinq ans.
C2 noun /ˈɒksɪdənt/

occident

occident
Meaning
The countries of the West, especially Europe and America.
Example
The Occident has a long history of philosophical thought.
L'Occident a une longue histoire de pensée philosophique.
B2 noun /ˈaʊtlet/

outlet

sortie
Meaning
a means by which something is released, expressed, or distributed
Example
Art is a great outlet for emotions.
L'art est une excellente sortie pour les émotions.
C2 noun /ˈɔː.rɪ.fɪs/

orifice

orifice
Meaning
an opening or hole, especially in the body or a device
Example
The medicine was applied through a small orifice in the device.
Le médicament a été appliqué par un petit orifice dans l'appareil.
B1 noun /ˈɒbstəkəlz/

obstacles

obstacles
Meaning
Things that block one's way or prevent or hinder progress.
Example
Obstacles in life can often lead to valuable lessons.
Les obstacles dans la vie mènent souvent à des leçons précieuses.
C1 noun /oʊˈbɪt.ʃu.er.i/

Obituary

nécrologie
Meaning
a notice of someone's death published in a newspaper; biographical account of deceased person
Example
The newspaper published his obituary yesterday.
Le journal a publié son nécrologie hier.
C1 adjective /əˈblɪɡ.ə.tɔː.ri/

obligatory

obligatoire
Meaning
Required by a legal, moral, or other rule; compulsory.
Example
Wearing a seatbelt is obligatory in most countries.
Porter une ceinture de sécurité est obligatoire dans la plupart des pays.
C2 verb /ˌoʊvərˈstraɪd/

overstride

franchir en faisant de grands pas
Meaning
To stride over something; to step across with long steps.
Example
He managed to overstride the narrow stream with ease.
Il a réussi à franchir le ruisseau étroit avec facilité.
B2 verb əbˈzɜːrvd

observed

observer
Meaning
To celebrate or keep a religious or other festival.
Example
The day is observed annually to raise awareness.
Le jour est observé chaque année pour sensibiliser.
B2 adverb /ˈəʊvəli/

overly

excessivement
Meaning
to an excessive degree or extent
Example
She was overly concerned about the results.
Elle était excessivement préoccupée par les résultats.
B2 noun /ˈɔr.fən.ɪʒ/

Orphanage

orphelinat
Meaning
an institution for the care and education of children who have lost their parents
Example
The charity built a new orphanage for homeless children.
La charité a construit un nouvel orphelinat pour les enfants sans abri.
C2 adjective /ˈoʊ.kən/

oaken

fait de chêne
Meaning
made of or resembling oak wood
Example
The villagers gathered around the oaken table in the hall.
Les villageois se sont rassemblés autour de la table en chêne dans la salle.
B2 adjective /ˈaʊtˌɡoʊɪŋ/

outgoing

sociable
Meaning
Friendly and sociable; inclined to mix with others.
Example
He is an outgoing person who loves meeting new people.
C'est une personne sociable qui aime rencontrer de nouvelles personnes.
B2 noun oʊˈbiː.sə.t̬i

obesity

obésité
Meaning
The condition of being grossly fat or overweight.
Example
Obesity increases the risk of diabetes and heart disease.
L'obésité augmente le risque de diabète et de maladies cardiaques.
C2 adjective /ˌɒbsəˈlɛsnt/

obsolescent

obsolète
Meaning
Becoming outdated or on the way to becoming obsolete.
Example
The obsolescent technology could not compete with modern devices.
La technologie obsolète ne pouvait pas concurrencer les appareils modernes.
C2 noun /ˈɒlɪv bɑːb/

Olive barb

barbe olive
Meaning
A small freshwater fish with olive-colored body and barbels
Example
The olive barb is commonly found in South Asian rivers.
La barbe olive se trouve couramment dans les rivières d’Asie du Sud.
A1 adverb /aʊt/

out

dehors
Meaning
moving or appearing away from the inside or center; not at home or present
Example
He stepped out of the room quietly.
Il est sorti de la pièce silencieusement.
B2 noun /wʌn θɜːd/

one-third

un tiers
Meaning
one part of something that is divided into three equal parts
Example
One-third of the class was absent today.
Un tiers de la classe était absent aujourd'hui.
A1 adjective/adverb /ˈoʊnli/

only

seul
Meaning
without others; solely
Example
He is the only person who knows the secret.
Il est la seule personne qui connaît le secret.
B2 adjective /aʊtˈreɪdʒəs/

outrageous

scandaleux
Meaning
Shockingly bad or excessive; very unusual or amusing.
Example
The comedian told an outrageous joke.
Le comédien a raconté une blague scandaleuse.
C1 noun ˌɒp.tɪ.maɪˈzeɪ.ʃən

optimization

optimisation
Meaning
Improving processes to increase performance and efficiency.
Example
SEO optimization helps websites rank higher on search engines.
L'optimisation SEO aide les sites web à se classer plus haut dans les moteurs de recherche.
C1 verb /uːz/

ooze

suinter
Meaning
to slowly flow or leak out through small openings or pores
Example
Blood began to ooze from the small cut.
Le sang a commencé à suinter de la petite coupure.
C1 verb /ˈoʊvərˌhɔːl/

overhaul

révision complète
Meaning
to examine thoroughly and repair or improve something that is worn or ineffective
Example
The company decided to overhaul its outdated computer system.
L'entreprise a décidé de rénover son système informatique obsolète.
A2 adjective /ˈɑp.ə.zɪt/

Opposite

opposé; complètement différent; face à face; inverse;
Meaning
Contrary; completely different; facing each other; reverse;
Example
They have opposite views on politics but remain good friends.
Ils ont des vues opposées sur la politique mais restent de bons amis.
C1 adjective /ˈɔːrθədɑːks/

orthodox

orthodoxe
Meaning
conforming to traditional beliefs or practices
Example
He comes from a very orthodox family.
Il vient d'une famille très orthodoxe.
C1 noun /ˌəʊvərɪksˌplɔɪˈteɪʃən/

overexploitation

surexploitation
Meaning
The unsustainable use of natural resources at a rate that exceeds their ability to regenerate, leading to depletion and environmental degradation.
Example
Overexploitation of natural resources leads to environmental degradation.
La surexploitation des ressources naturelles conduit à la dégradation de l'environnement.
B1 noun /ˈɑp.ʃən/

Option

option
Meaning
a thing that is or may be chosen; an alternative course of action
Example
You have the option to work from home or office.
Vous avez l'option de travailler depuis chez vous ou au bureau.
A1 conjunction /ɔːr/

or

ou
Meaning
used to link alternatives
Example
You can have tea or coffee.
Vous pouvez prendre du thé ou du café.
C1 adjective /əbˈtjuːs/

Obtuse

obtus; lent à comprendre; sans intelligence
Meaning
annoyingly insensitive or slow to understand; lacking in intelligence or perception
Example
He was being deliberately obtuse about the instructions.
Il était délibérément obtus à propos des instructions.
C1 adjective /ɔːˈneɪt/

ornate

orné
Meaning
elaborately or highly decorated
Example
The palace hall was filled with ornate furniture and paintings.
La salle du palais était remplie de meubles ornés et de peintures.
C1 noun /ˈɑːlɪˌɡɑːrki/

oligarchy

oligarchie
Meaning
A small group of people having control of a country, organization, or institution.
Example
The nation was ruled by a wealthy oligarchy that controlled all resources.
La nation était dirigée par une oligarchie riche qui contrôlait toutes les ressources.
C2 noun /ˈɒbsɪkwiːz/

obsequies

rites funéraires
Meaning
Funeral rites or ceremonies.
Example
The obsequies for the late leader drew thousands of mourners.
Les rites funéraires du leader défunt ont attiré des milliers de personnes en deuil.
C2 adjective /əbˈsiːkwɪəs/

obsequious

servile
Meaning
Excessively obedient or attentive in a servile way.
Example
The waiter gave an obsequious bow to every customer.
Le serveur fit une révérence servile à chaque client.
C1 noun /ˈɒktɪv/

octave

octave
Meaning
A series of eight musical notes, or the interval between one musical pitch and another with double its frequency.
Example
The singer's voice could easily reach the higher octave.
La voix du chanteur pourrait facilement atteindre l'octave supérieure.
B2 noun /ˈɑp.tə.mɪst/

Optimist

optimiste
Meaning
a person who tends to be hopeful and confident about the future; someone who sees the good side of things
Example
As an optimist, she always believed things would improve.
En tant qu'optimiste, elle a toujours cru que les choses s'amélioreraient.
C2 noun /ˌɔːrnɪˈθɑːlədʒi/

ornithology

ornithologie
Meaning
the scientific study of birds
Example
She pursued ornithology to understand the migration patterns of birds.
Elle a poursuivi l'ornithologie pour comprendre les schémas de migration des oiseaux.
C2 noun /ˌɔːrnɪˈθɒlədʒɪst/

ornithologist

ornithologue
Meaning
a scientist who studies birds
Example
The ornithologist spent years studying migratory birds.
L'ornithologue a passé des années à étudier les oiseaux migrateurs.
C2 verb /əˈkluːd/

occlude

obstruer
Meaning
To block or close up an opening or passage.
Example
The pipe was occluded by mineral deposits.
Le tuyau était obstrué par des dépôts minéraux.
B1 verb /oʊ/

owe

devoir
Meaning
to be under obligation to pay or repay; to be indebted
Example
I owe my success to my parents' support.
Je dois mon succès au soutien de mes parents.
C2 adjective /ˈɒkjʊlər/

ocular

oculaire
Meaning
Relating to the eye or vision.
Example
The patient was referred to a specialist for ocular treatment.
Le patient a été orienté vers un spécialiste pour un traitement oculaire.
B2 noun /ˌaʊtˈsaɪdə(r)/

outsider

étranger
Meaning
a person who is not accepted as a member of a particular group or community
Example
As a new student, she often felt like an outsider at school.
En tant que nouvelle étudiante, elle se sentait souvent comme une étrangère à l'école.
A2 noun /ˈʌn.jən/

Onion

oignon
Meaning
a round vegetable with a strong taste and smell, made up of many layers
Example
I need to chop some onions for the curry recipe.
J'ai besoin de couper des oignons pour la recette du curry.
B2 noun /ˈɔːɡən/

organ

organe
Meaning
a part of the body that performs a specific function
Example
The heart is an important organ in the human body.
Le cœur est un organe important dans le corps humain.
B1 noun ˌɔː.ɡən.aɪˈzeɪ.ʃənz

organizations

organisations
Meaning
Organized groups of people with a particular purpose
Example
Organizations play a key role in policymaking.
Les organisations jouent un rôle clé dans l'élaboration des politiques.
C2 verb /əbˈvɜːrt/

obvert

inverser
Meaning
To turn something so as to face in a different direction; in logic, to convert a proposition by negating both subject and predicate.
Example
The teacher asked the students to obvert the statement for practice.
Le professeur a demandé aux étudiants de convertir la déclaration pour s'exercer.
B1 adjective /ˌoʊld ˈfæʃənd/

old-fashioned

démodé
Meaning
not modern; belonging to an earlier time
Example
He still wears an old-fashioned hat.
Il porte encore un chapeau démodé.
C1 verb /ˈɒfsɛt/

offset

compenser
Meaning
To counterbalance or compensate for something.
Example
The company's losses were offset by gains in other departments.
Les pertes de l'entreprise ont été compensées par des gains dans d'autres départements.
B2 adjective /ˌɔːɡənaɪˈzeɪʃənəl/

organizational

organisationnel
Meaning
relating to the structure or arrangement of a company or group
Example
He works on improving the organizational structure of the company.
Il travaille à améliorer la structure organisationnelle de l'entreprise.
C1 verb /ˈɒs.ɪ.leɪt/

oscillate

se balancer ou se déplacer d'un point à un autre entre deux états
Meaning
To swing or move back and forth between two points or states
Example
The stock market tends to oscillate during uncertain times.
Le marché boursier a tendance à osciller pendant les périodes incertaines.
B1 noun əbˈdʒek.tɪv

objective

objectif
Meaning
A thing aimed at or sought; a goal.
Example
The main objective is to test sustainability.
L'objectif principal est de tester la durabilité.
B2 adverb /ˈaʊtraɪt/

Outright

directement; complètement; sans réserve
Meaning
completely; directly; without reservation or concealment
Example
She rejected the proposal outright.
Elle a rejeté la proposition directement.
C1 verb /əbˈstrʌkt/

obstruct

obstruer
Meaning
to block or hinder progress; to prevent or impede movement
Example
The fallen tree obstructed the road for several hours.
L'arbre tombé obstruait la route pendant plusieurs heures.
C1 adjective /əbˈzɜːrvənt/

Observant

observateur
Meaning
quick to notice things; watchful; attentive
Example
The observant detective noticed every small detail at the crime scene.
Le détective observateur a remarqué chaque petit détail sur la scène du crime.
B2 noun /ˈɔːɡənɪzəm/

organism

organisme
Meaning
a living thing that has an organized structure and can grow and reproduce
Example
Every organism needs water to survive.
Chaque organisme a besoin d'eau pour survivre.
B2 adjective /əˈfen.sɪv/

Offensive

offensant; insultant; agressif
Meaning
causing displeasure or resentment; insulting; aggressive
Example
His offensive remarks hurt everyone's feelings.
Ses remarques offensantes ont blessé les sentiments de tout le monde.
C2 noun ˌɒbfəsˈkeɪʃən

obfuscation

obfuscation, confusion
Meaning
The action of making something obscure, unclear, or unintelligible.
Example
The obfuscation of the data made it difficult to interpret.
L'obfuscation des données a rendu leur interprétation difficile.
A1 adjective /oʊld/

old

vieux
Meaning
having lived for a long time; not new or young
Example
He still drives his old car.
Il conduit toujours sa vieille voiture.
C1 adjective /ˈɒptɪkəl/

optical

optique
Meaning
related to or used in seeing or sight
Example
The optical illusion fooled everyone at the exhibition.
L'illusion optique a trompé tout le monde lors de l'exposition.
B2 noun/verb /ˈaʊtreɪdʒ/

outrage

indignation
Meaning
A strong feeling of anger and shock; to arouse anger or shock.
Example
The unfair decision caused public outrage.
La décision injuste a provoqué une indignation publique.
A1 preposition, adverb /ˈoʊvər/

over

sur
Meaning
across, on top of, or beyond
Example
The book is lying over the table.
Le livre est posé sur la table.
A2 adjective /ˈaʊtdɔːr/

outdoor

en plein air
Meaning
situated, existing, or done outside a building
Example
We planned an outdoor picnic for the weekend.
Nous avons prévu un pique-nique en plein air pour le week-end.
C2 noun /ˌoʊpəˈlɛsəns/

opalescence

opalescence
Meaning
a milky or pearly appearance of a surface like that of an opal
Example
The pearl had a gentle opalescence under the light.
La perle avait une douce opalescence sous la lumière.
B2 noun ˈɔː.bɪt

orbit

orbite
Meaning
The curved path of a celestial object around a star, planet, or moon.
Example
The satellite maintains its orbit around Earth.
Le satellite maintient son orbite autour de la Terre.
C2 verb /ˌaʊtməˈnuːvər/

outmaneuver

surpasser habilement
Meaning
to gain an advantage over an opponent by skillful or clever action
Example
The smaller company managed to outmaneuver its larger rival.
La petite entreprise a réussi à surpasser habilement son grand concurrent.
C1 adjective /aʊtˈmoʊdɪd/

outmoded

démodé
Meaning
No longer in fashion or useful; outdated.
Example
That old computer is completely outmoded.
Cet ancien ordinateur est complètement démodé.
C2 noun /ɒmˈnɪʃəns/

omniscience

omniscience
Meaning
the state of knowing everything
Example
The novel's narrator has an air of omniscience, revealing every character's thoughts.
Le narrateur du roman a un air d'omniscience, révélant les pensées de chaque personnage.
B2 noun /əˌrɪʒ.əˈnæl.ə.ti/

Originality

originalité
Meaning
the quality of being novel or unusual; the ability to think independently and creatively
Example
The artist's work showed great originality and creativity.
Le travail de l'artiste a montré une grande originalité et créativité.
A2 adverb; noun /ˌaʊtˈdɔːrz/

outdoors

à l’extérieur
Meaning
outside a building; the natural environment outside
Example
We spent the whole afternoon outdoors enjoying the fresh air.
Nous avons passé tout l’après-midi à l’extérieur à profiter de l’air frais.
C2 verb /oʊˈpaɪn/

opine

exprimer une opinion
Meaning
to express an opinion or belief
Example
The professor opined that the policy would fail.
Le professeur a exprimé que la politique échouerait.
B2 verb /ˌoʊvərˈwɛlm/

overwhelm

accabler
Meaning
to overpower someone emotionally or physically; to be too much to handle
Example
She was overwhelmed with gratitude after receiving the help.
Elle était submergée de gratitude après avoir reçu de l'aide.
B1 adverb /ˈʌðərwaɪz/

Otherwise

autrement; sinon
Meaning
in a different way; if not; or else; apart from that
Example
Study hard, otherwise you will fail the exam.
Étudie dur, sinon tu échoueras à l'examen.
C1 noun ˈaʊt.sɔːr.sɪŋ

outsourcing

externalisation
Meaning
The practice of having certain job functions done outside a company instead of having an in-house department or employee handle them.
Example
Many companies use outsourcing to reduce labor costs.
De nombreuses entreprises utilisent l'externalisation pour réduire les coûts de main-d'œuvre.
C1 verb /ˌoʊvərˈruːl/

overrule

rejeter
Meaning
to reject or disallow by exercising one's superior authority; to override a decision
Example
The judge overruled the objection from the defense attorney.
Le juge a rejeté l'objection de l'avocat de la défense.
B2 adjective /ˈɔɪl.i/

Oily

huileux; recouvert d'huile; gras
Meaning
covered with oil; containing oil; greasy
Example
Her oily skin needs special care.
Sa peau huileuse a besoin de soins spéciaux.
B1 verb /əbˈzɜːrv/

observe

observer
Meaning
to watch carefully; to notice or perceive something
Example
Scientists observe the behavior of animals in the wild.
Les scientifiques observent le comportement des animaux dans la nature.
A2 noun /ˈɒm.lət/

Omelet

omelette
Meaning
a dish made from beaten eggs cooked in a frying pan and often folded around a filling
Example
She made a cheese omelet for breakfast.
Elle a préparé une omelette au fromage pour le petit déjeuner.
C1 adverb /ˈaʊtwədli/

Outwardly

extérieurement; en apparence;
Meaning
on the surface; externally; in appearance
Example
Outwardly, he seemed calm, but inside he was nervous.
Extérieurement, il semblait calme, mais à l'intérieur, il était nerveux.
C1 verb /ˌoʊvərˈrʌn/

overrun

envahir
Meaning
to spread over or occupy completely; to exceed a limit or time
Example
The garden was overrun with weeds.
Le jardin était envahi par les mauvaises herbes.
B2 noun /ˈɔːrnəmənt/

ornament

ornement
Meaning
A decorative object that adds beauty to something.
Example
The Christmas tree was decorated with colorful ornaments.
L'arbre de Noël était décoré avec des ornements colorés.
C2 adjective /ˈoʊ.pən ˈhɑrt.ɪd/

Open-hearted

chaleureux et généreux; sincère et honnête; réceptif chaleureusement;
Meaning
Kind and generous; sincere and honest; warmly receptive;
Example
She welcomed the strangers with an open-hearted smile and invited them for dinner.
Elle a accueilli les étrangers avec un sourire chaleureux et les a invités à dîner.
C1 noun /ˈɒktəɡən/

octagon

octogone
Meaning
A polygon with eight sides and eight angles.
Example
The stop sign is shaped like an octagon.
Le panneau stop a la forme d'un octogone.
C2 noun /oʊliˈændər/

Oleander

oléandre
Meaning
a poisonous evergreen shrub with clusters of white, pink, or red flowers
Example
The beautiful oleander flowers bloomed in the garden despite their toxic nature.
Les belles fleurs d'oléanre ont fleuri dans le jardin malgré leur nature toxique.
C1 verb /ˌaʊtˈduː/

outdo

surpasser
Meaning
To do better than someone else; to surpass.
Example
She always tries to outdo her classmates in exams.
Elle essaie toujours de surpasser ses camarades de classe lors des examens.
C2 adjective /əˈprəʊ.bri.əs/

opprobrious

désobligeant
Meaning
Expressing strong criticism or scorn.
Example
He made opprobrious remarks about his opponent.
Il a fait des remarques désobligeantes sur son adversaire.
C1 noun /ˈɒn.slɔːt/

onslaught

assaut
Meaning
A fierce or destructive attack.
Example
The village faced an onslaught of enemy forces.
Le village a fait face à un assaut des forces ennemies.
C2 adjective /ˈɔːrəˌtʌnd/

orotund

voix profonde et claire
Meaning
full, rich, and clear in sound; pompous in style
Example
The actor's orotund voice filled the theater.
La voix profonde de l'acteur a rempli le théâtre.
C2 noun /ˈɒbsɪkwi/

obsequy

obsèque
Meaning
A funeral rite, usually used in plural form obsequies.
Example
The village gathered for the obsequy of their beloved teacher.
Le village s'est réuni pour l'obseque de leur cher professeur.
A1 adjective /əʊˈkeɪ/

okay

d'accord
Meaning
used to express agreement or acceptance
Example
It's okay to leave early today.
Il est d'accord de partir tôt aujourd'hui.
C1 adjective /ˈɔːrdɪnəl/

ordinal

ordinal
Meaning
Relating to the order or position of something in a sequence (first, second, third, etc.).
Example
The ordinal number 'third' indicates position in a sequence.
Le numéro ordinal 'troisième' indique la position dans une séquence.
B1 noun /ˈɑb.stə.kəl/

Obstacle

obstacle
Meaning
something that blocks or makes progress difficult; a barrier
Example
Bad weather was the main obstacle to our journey.
Le mauvais temps était le principal obstacle à notre voyage.
C1 noun /ˈɔːrθədɑːksi/

orthodoxy

orthodoxie
Meaning
traditional or generally accepted beliefs and practices
Example
The religious leader defended the orthodoxy of the faith.
Le leader religieux a défendu l'orthodoxie de la foi.
C1 adverb /ˈɒp.tɪ.məl.i/

optimally

de manière optimale
Meaning
In the most effective or efficient way possible.
Example
Tasks should be allocated optimally for maximum output.
Les tâches doivent être attribuées de manière optimale pour un rendement maximal.
B1 adjective /əˈbiː.di.ənt/

Obedient

obéissant
Meaning
willing to comply with orders or instructions; submissive
Example
The obedient student always follows the teacher's instructions.
L'élève obéissant suit toujours les instructions du professeur.
C1 noun ˌɒb.səˈlɛs.əns

obsolescence

obsolescence
Meaning
The process of becoming obsolete or outdated and no longer used.
Example
The rapid advancement of technology leads to the obsolescence of old devices.
Le progrès rapide de la technologie entraîne l’obsolescence des anciens appareils.
C2 noun /ˈoʊ.vər.let/

Overlet

surmatelas
Meaning
a thin mattress or pad placed over a bed for additional comfort
Example
The overlet makes the bed more comfortable to sleep on.
Le surmatelas rend le lit plus confortable pour dormir.
C2 noun /ɒmˈnɪpətəns/

omnipotence

omnipotence
Meaning
The quality of having unlimited power or authority.
Example
Many religions describe God’s omnipotence as absolute.
De nombreuses religions décrivent l'omnipotence de Dieu comme absolue.
B2 verb /ˈɒkjʊpaɪ/

occupy

occuper
Meaning
to take up space or time; to live or work in a place
Example
The new family will occupy the house next month.
La nouvelle famille occupera la maison le mois prochain.
B1 noun /əˈpɪn.jən/

Opinion

opinion
Meaning
a view or judgment formed about something; a belief or assessment based on grounds short of proof
Example
In my opinion, this is the best solution.
À mon avis, c'est la meilleure solution.
A2 noun /əˈlɪmpɪks/

olympics

Jeux Olympiques
Meaning
an international sports competition held every four years with athletes from many countries
Example
The Olympics bring athletes from all over the world together.
Les Jeux Olympiques réunissent des athlètes du monde entier.
B2 adjective; verb (past participle) /ˈɒkjʊpaɪd/

occupied

occupé
Meaning
being in use or taken; filled or lived in; controlled or held by force
Example
The room is occupied, so please wait outside.
La chambre est occupée, veuillez attendre dehors.
B2 noun ˈaʊt.pʊt

output

production
Meaning
The amount of something produced by a person, machine, or industry.
Example
Climate change reduces agricultural output.
Le changement climatique réduit la production agricole.
C2 adjective /ˈɒpjʊlənt/

opulent

opulent
Meaning
Ostentatiously rich, luxurious, or lavish.
Example
They hosted an opulent wedding with gold decorations.
Ils ont organisé un mariage opulent avec des décorations dorées.
C2 verb ˈɑːb.fə.skeɪt

obfuscate

obscurcir, embrouiller, mystifier
Meaning
Render obscure, unclear, or unintelligible.
Example
Politicians often obfuscate facts to mislead people.
Les politiciens obfusquent souvent les faits pour induire les gens en erreur.
B2 noun ˈɒksɪdʒən prəˈdʌkʃən

oxygen production

production d'oxygène
Meaning
The process of generating oxygen through photosynthesis or other means.
Example
Plants are vital for oxygen production and the maintenance of life.
Les plantes sont vitales pour la production d'oxygène et le maintien de la vie.
C2 verb /aʊtˈraɪd/

outride

dépasser
Meaning
to ride faster, farther, or better than someone else
Example
The young rider managed to outride his competitors in the race.
Le jeune cavalier a réussi à dépasser ses concurrents dans la course.
C1 noun /ˈoʊ.mən/

Omen

un signe de bonne ou mauvaise chance future
Meaning
an event regarded as a sign of future good or bad luck
Example
Many people consider a black cat crossing your path a bad omen.
Beaucoup de gens considèrent qu'un chat noir traversant votre chemin est un mauvais présage.
C1 noun /ˈɒstrəsɪzəm/

ostracism

ostracisme
Meaning
The act of excluding someone from a group or society.
Example
The student faced ostracism after breaking the rules.
L'étudiant a fait face à l'ostracisme après avoir enfreint les règles.
B1 verb /ˈɔːrɡənaɪz/

organize

organiser
Meaning
to arrange systematically; to plan and coordinate
Example
She organized a surprise party for her friend.
Elle a organisé une fête surprise pour son amie.