outlandish
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C1 adjective /ˌaʊtˈlændɪʃ/

outlandish

bizarre
Meaning
Looking or sounding bizarre or unfamiliar; strange.
Example
He wore an outlandish costume to the festival.
Il portait un costume bizarre au festival.
C1 adjective /ˌɑːpərˈtuːn/

opportune

moment opportun
Meaning
Happening at a suitable or convenient time.
Example
She arrived at an opportune moment to help.
Elle est arrivée à un moment opportun pour aider.
C1 adjective ˈɒptɪmaɪzd

optimized

optimisé, amélioré, plus efficace
Meaning
Made as fully perfect, functional, or effective as possible; improved to achieve maximum efficiency.
Example
The system has been optimized for faster performance.
Le système a été optimisé pour des performances plus rapides.
B1 verb অকার্স

occurs

se produit
Meaning
Happens or takes place, especially as a result of something.
Example
Snowfall occurs in regions with freezing temperatures.
La neige se produit dans les régions où les températures sont inférieures à zéro.
A2 noun /ˈɒbdʒɪkt/

object

objet
Meaning
a thing that can be seen and touched
Example
The table is an object in the room.
La table est un objet dans la pièce.
C1 noun/verb /ˈoʊvərˌhæŋ/

overhang

saillie
Meaning
To extend outward and hang over something; a projecting part.
Example
The roof overhang provides shade in the summer.
Le surplomb fournit de l'ombre en été.
B2 noun /ˈɒfərɪŋ/

offering

offre
Meaning
something that is given, especially as a gift or contribution
Example
The company’s latest offering is an eco-friendly car.
La dernière offre de l'entreprise est une voiture écologique.
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.
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.
C2 adjective /ˌoʊvərˈwiːnɪŋ/

overweening

arrogant excessif
Meaning
excessively arrogant or prideful
Example
His overweening pride cost him many friends.
Son excès de fierté lui a coûté de nombreux amis.
C1 adjective /əˈprɛs.ɪv/

Oppressive

oppressif
Meaning
Harsh and authoritarian; overwhelming; causing distress; tyrannical;
Example
The oppressive heat made it difficult to work outside during the summer.
La chaleur oppressante rendait difficile de travailler à l'extérieur pendant l'été.
C1 adjective /ˈaʊt.kɑːst/

Outcast

rejeté
Meaning
rejected by society; excluded person
Example
He felt like an outcast in his new school.
Il s'est senti comme un rejeté dans sa nouvelle école.
C2 noun /əˈprəʊ.bri.əm/

opprobrium

opprobre, déshonneur
Meaning
Harsh criticism or public disgrace.
Example
The scandal brought opprobrium on the politician.
Le scandale a apporté l'opprobre au politicien.
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 /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.
C1 noun /ˌɑːpərˈtuːnɪst/

opportunist

opportuniste
Meaning
A person who takes advantage of situations for personal gain, often disregarding principles.
Example
He is seen as an opportunist who always puts his interests first.
Il est vu comme un opportuniste qui met toujours ses intérêts en premier.
C1 noun /ˈɒfʃuːt/

offshoot

dérivé
Meaning
A branch or result that develops from something larger or more important.
Example
The startup was an offshoot of a major tech company.
La startup était un dérivé d'une grande entreprise technologique.
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 adjective /ˌəʊvərˈstɪmjʊˌleɪtɪd/

overstimulated

trop stimule
Meaning
Excessively excited or aroused, overwhelmed by too much stimulus.
Example
Overstimulated minds can lead to burnout and decreased productivity.
Des esprits trop stimulés peuvent conduire à l'épuisement professionnel et à une diminution de la productivité.
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.
C2 noun /oʊf/

Oaf

une personne maladroite, stupide ou insensible
Meaning
a clumsy, stupid, or insensitive person
Example
Don't be such an oaf - handle the dishes carefully!
Ne sois pas un oaf - manipule les plats avec soin !
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.
A1 adverb /wʌns/

Once

une fois seulement; autrefois
Meaning
one time only; at some time in the past; formerly
Example
I have been to Paris once in my life.
Je suis allé à Paris une fois dans ma vie.
C2 adjective /ˈɑːsɪˌfaɪd/

ossified

transformé en os, rigide
Meaning
Turned into bone or become rigid; unwilling to change.
Example
The company had an ossified management structure that resisted innovation.
L'entreprise avait une structure de gestion rigide qui résistait à l'innovation.
C1 adjective ˈɒb.stɪ.nət

obstinate

obstiné
Meaning
Refusing to change one's mind or accept others' advice easily.
Example
He remained obstinate despite the logical arguments.
Il est resté obstiné malgré les arguments logiques.
C1 noun /ˈɔr.ə.kəl/

Oracle

oracle
Meaning
a person regarded as a source of wise counsel; in ancient times, a priest or priestess acting as a medium
Example
The ancient Greeks consulted the oracle at Delphi.
Les anciens Grecs consultaient l'oracle de Delphes.
A2 noun /ˈʌv.ən/

Oven

four
Meaning
an enclosed compartment used for heating, baking, or drying food
Example
She baked cookies in the oven for thirty minutes.
Elle a cuit des biscuits dans le four pendant trente minutes.
C2 noun ˈoʊʃən ˌstrætɪfɪˈkeɪʃən

ocean stratification

stratification océanique
Meaning
The formation of layers in ocean water due to differences in density.
Example
Ocean stratification affects marine biodiversity.
La stratification océanique affecte la biodiversité marine.
A2 noun /ˈɒf.ɪs/

office

bureau
Meaning
a room or building where people work, usually at desks
Example
She left the office early to attend a family event.
Elle a quitté le bureau tôt pour assister à un événement familial.
A2 preposition /ˈɒntu/

onto

sur
Meaning
moving to a position on the surface of something
Example
She jumped onto the table to get the book.
Elle a sauté sur la table pour prendre le livre.
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.
C1 noun /əbˈzɜːrvətɔːri/

observatory

observatoire
Meaning
A building equipped for observing astronomical or meteorological events.
Example
The observatory is open to the public on weekends.
L'observatoire est ouvert au public le week-end.
A2 noun əˈlɪm.pɪk ɡeɪmz

Olympic Games

jeux olympiques
Meaning
The world's largest international sports competition held every four years, bringing together athletes from different countries to compete in various sports.
Example
The Olympic Games bring together the world's top athletes.
Les Jeux Olympiques réunissent les meilleurs athlètes du monde.
B2 adjective /ˈɒp.tɪ.məl/

optimal

optimal, le plus favorable
Meaning
Best or most favorable; the most effective under particular conditions.
Example
The optimal temperature for plant growth is around 25°C.
La température optimale pour la croissance des plantes est d'environ 25°C.
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.
C2 adjective /əbˈtruːsɪv/

obtrusive

intrusif
Meaning
noticeable in an unpleasant or unwelcome way; intrusive
Example
The advertisement was so obtrusive that it ruined the user’s experience.
La publicité était tellement intrusive qu'elle a ruiné l'expérience de l'utilisateur.
B1 noun /ˈɑː.lɪv/

Olive

olive
Meaning
a small oval fruit with a hard pit, typically green or black, used for eating or making oil
Example
Olive oil is considered one of the healthiest cooking oils available.
L'huile d'olive est considérée comme l'une des huiles de cuisson les plus saines disponibles.
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.
B2 verb /ˌoʊvərˈlʊk/

overlook

ignorer
Meaning
to fail to notice or consider something; to have a view from above
Example
It's easy to overlook small details when you're in a hurry.
Il est facile de passer à côté des petits détails quand on est pressé.
A1 pronoun /ˈʌðərz/

others

autres
Meaning
people or things distinct from the ones already mentioned or known
Example
I like to spend time with others.
J'aime passer du temps avec les autres.
C1 noun /ˈaʊtˌɡroʊθ/

outgrowth

croissance
Meaning
something that grows out of something else; a natural development or result
Example
The new policy was an outgrowth of years of debate.
La nouvelle politique était une croissance de plusieurs années de débats.
C2 adjective /əˈfɪʃəs/

officious

médicule
Meaning
Excessively eager to offer unwanted help or advice; meddlesome.
Example
The officious guard kept interrupting the visitors with unnecessary instructions.
Le garde médicule interrompait les visiteurs avec des instructions inutiles.
C2 noun /ɔːˈreɪʃən/

oration

discours
Meaning
A formal speech, especially one given on a ceremonial occasion
Example
The president delivered an inspiring oration.
Le président a prononcé un discours inspirant.
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.
B2 adjective /ˌoʊvərˈwɛlmɪŋ/

overwhelming

accablant
Meaning
Very intense; overpowering.
Example
Large tasks can feel overwhelming.
Les grandes tâches peuvent sembler accablantes.
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.
A2 noun /ˈoʊ.nər/

Owner

propriétaire
Meaning
a person who owns something; someone who has legal possession of property
Example
The owner of the restaurant greeted us warmly.
Le propriétaire du restaurant nous a accueillis chaleureusement.
B2 adjective /ˈɒp.ʃən.əl/

Optional

facultatif
Meaning
not compulsory; left to choice
Example
Wearing a tie is optional for this event.
Porter une cravate est facultatif pour cet événement.
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.
B2 noun ˈoʊzoʊn dɪˈpliʃən

ozone depletion

diminution de l'ozone
Meaning
The reduction in the amount of ozone in the Earth's stratosphere, leading to increased UV radiation.
Example
Ozone depletion increases UV radiation.
La déplétion de l'ozone augmente les radiations UV.
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.
C2 noun /ˌɒktədʒəˈnɛəriən/

octogenarian

octogénaire
Meaning
A person who is between 80 and 89 years old.
Example
The octogenarian still jogs every morning to stay healthy.
L'octogénaire court encore chaque matin pour rester en bonne santé.
C2 adjective /ˈɒf.biːt/

offbeat

inhabituel
Meaning
Unusual, unconventional, or different from the norm.
Example
She has a very offbeat sense of humor.
Elle a un sens de l'humour très inhabituel.
B1 adverb /əˈrɪdʒɪnəli/

originally

à l'origine
Meaning
in the beginning, at first
Example
Originally, she wanted to be a doctor.
À l'origine, elle voulait être médecin.
B1 noun ˈɒk.sɪ.dʒən

oxygen

oxygène. Un gaz incolore et inodore, essentiel pour la vie.
Meaning
A colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
Example
Oxygen is vital for life.
L'oxygène est vital pour la vie.
A1 verb, adjective /oʊn/

own

posséder
Meaning
to possess something; belonging to oneself
Example
She owns a beautiful house in the city.
Elle possède une belle maison en ville.
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.
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.
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.
B2 noun /əˈpoʊ.nənt/

Opponent

opposant; rival
Meaning
a person who disagrees with or resists a proposal or practice; someone who competes against another
Example
The chess player defeated his strongest opponent.
Le joueur d'échecs a battu son plus fort opposant.
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.
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.
B2 verb /əˈrɪdʒɪneɪt/

originate

provenir
Meaning
to come into existence; to begin; to create or produce
Example
The tradition originated in ancient times.
La tradition est née dans les temps anciens.
C1 adjective /ɒmˈnɪv.ər.əs/

Omnivorous

omnivore
Meaning
eating both plants and animals; feeding on various kinds of food
Example
Bears are omnivorous animals that eat both plants and meat.
Les ours sont des animaux omnivores qui mangent à la fois des plantes et de la viande.
C2 adjective /əbˈstrɛpərəs/

obstreperous

tapageur et difficile à contrôler
Meaning
Noisy and difficult to control.
Example
The obstreperous students disrupted the class.
Les étudiants tapageurs ont perturbé le cours.
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.
C1 noun /ˈɑːdəsi/

odyssey

long voyage
Meaning
a long, adventurous journey; a series of experiences
Example
Her career has been an odyssey of challenges and achievements.
Sa carrière a été une odyssée de défis et de réussites.
B2 adjective /ˌɑːp.təˈmɪs.tɪk/

optimistic

optimiste
Meaning
hopeful and confident about the future
Example
She is optimistic about the success of her new project.
Elle est optimiste quant au succès de son nouveau projet.
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.
B2 noun /ˌɒb.zəˈveɪ.ʃənz/

observations

observation
Meaning
The action or process of observing something carefully.
Example
Observations of distant galaxies provide new insights.
Les observations des galaxies lointaines offrent de nouvelles perspectives.
B2 noun /oʊˈbiː.di.əns/

Obedience

obéissance
Meaning
compliance with an order, request, or law; submission to authority
Example
Children should show obedience to their parents.
Les enfants doivent montrer de l'obéissance envers leurs parents.
A2 modal verb /ɔːt/

ought

devrait
Meaning
Used to indicate duty, correctness, or moral obligation.
Example
You ought to respect your elders.
Tu devrais respecter tes aînés.
B2 noun ˈəʊnəʃɪp

ownership

propriété
Meaning
The act, state, or right of possessing something; legal title to something.
Example
Ownership of resources was crucial.
La propriété des ressources était cruciale.
C1 noun /ˈɔːrkɪd/

Orchid

orchidée
Meaning
a diverse family of flowering plants known for their exotic and often fragrant flowers
Example
The white orchid on the windowsill bloomed for months.
L'orchidée blanche sur le rebord de la fenêtre a fleuri pendant des mois.
C2 noun /oʊd/

ode

ode
Meaning
a lyrical poem, often expressing praise or strong emotions
Example
The poet wrote an ode to the beauty of nature.
Le poète a écrit une ode à la beauté de la nature.
B2 noun /ˈɒpəreɪtər/

operator

opérateur
Meaning
a person who operates equipment, a business, or controls something
Example
The machine operator ensured that everything ran smoothly.
L'opérateur de la machine s'est assuré que tout fonctionnait correctement.
C1 noun /ˈɒf.sprɪŋ/

offspring

progéniture
Meaning
a person's child or children; an animal's young
Example
The bird carefully fed its offspring.
L'oiseau a nourri soigneusement sa progéniture.
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.
B1 noun /aʊl/

Owl

hibou
Meaning
a nocturnal bird of prey with large eyes and a hooked beak
Example
The owl hooted softly in the darkness of the forest.
Le hibou hululait doucement dans l'obscurité de la forêt.
B2 adverb /əˈfɪʃəli/

officially

officiellement
Meaning
in a formal or authorized way
Example
The building was officially opened by the mayor.
Le bâtiment a été officiellement inauguré par le maire.
B2 noun ɔːˈɡæn.ɪk fuːdz

organic foods

aliments biologiques
Meaning
Food produced without the use of chemicals such as artificial pesticides, fertilizers, or other artificial agents.
Example
Organic foods are healthier than processed foods.
Les aliments biologiques sont plus sains que les aliments transformés.
B2 noun /ˈaʊtˌskɜːrt/

outskirt

la périphérie de la ville
Meaning
the outer edge or border of a town or city
Example
They built a new factory on the outskirts of the city.
Ils ont construit une nouvelle usine en périphérie de la ville.
C2 noun /ˈɒn.rʌʃ/

onrush

ruée
Meaning
A sudden powerful forward or downward rush or flow.
Example
The onrush of water swept away the bridge.
La ruée d'eau emporta le pont.
C2 noun /ˈɔːrdnəns/

ordnance

fournitures militaires
Meaning
Military supplies including weapons, ammunition, and combat equipment.
Example
The army stored ordnance in a secure facility outside the city.
L'armée a stocké des fournitures militaires dans une installation sécurisée en dehors de la ville.
B2 adjective /əˈpəʊzd/

opposed

opposé
Meaning
being against or in disagreement with something
Example
She is strongly opposed to animal testing.
Elle est fermement opposée aux tests sur les animaux.
C1 noun /oʊˈveɪʃən/

ovation

ovation
Meaning
an enthusiastic show of approval, especially by clapping hands
Example
The actor received a standing ovation after his performance.
L'acteur a reçu une ovation debout après sa performance.
C1 noun /ˈɔɪntmənt/

ointment

onguent
Meaning
A smooth, oily substance applied to the skin for healing or soothing.
Example
The doctor prescribed an ointment for the burn on his arm.
Le médecin a prescrit un onguent pour la brûlure sur son bras.
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.
B2 noun /ˈoʊvərpæs/

overpass

passerelle
Meaning
A bridge that carries one road or railway over another.
Example
The new overpass reduced traffic congestion in the city.
Le nouveau passerelle a réduit la congestion du trafic en ville.
C1 adjective /əˈkʌlt/

occult

occultes
Meaning
Relating to mysterious, supernatural, or magical powers and practices.
Example
She had always been fascinated by the occult and its hidden knowledge.
Elle a toujours été fascinée par l'occulte et sa connaissance cachée.
C2 noun /ˈɔːrzmən/

Oarsman

rameur
Meaning
a person who rows a boat, especially as a member of a racing crew
Example
The experienced oarsman rowed the boat across the river.
Le rameur expérimenté a ramé le bateau à travers le fleuve.
B2 noun /ˈaʊtˌbreɪk/

outbreak

épidémie
Meaning
a sudden start or occurrence of something unpleasant, like disease or violence
Example
There was an outbreak of flu in the city.
Il y a eu une épidémie de grippe dans la ville.
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.
C2 verb /ˌoʊvərˈliːp/

overleap

sauter par-dessus
Meaning
To jump over something; to omit or disregard something.
Example
He managed to overleap the fence easily.
Il a réussi à sauter la clôture facilement.
C1 noun /ˈoʊvərˌtʊr/

overture

ouverture / proposition
Meaning
An introduction to something more substantial; a proposal or preliminary action.
Example
The peace overture was welcomed by both nations.
L'ouverture de la paix a été accueillie favorablement par les deux nations.
C1 verb /ˈɒp.tɪ.maɪz/

optimize

optimiser
Meaning
To make the best or most effective use of a situation, opportunity, or resource.
Example
The company is working to optimize its supply chain.
L'entreprise travaille à optimiser sa chaîne d'approvisionnement.
A2 adjective /ˈɔː.dɪ.nər.i/

Ordinary

ordinaire; normal; pas spécial
Meaning
normal; usual; not special
Example
It was just an ordinary day at the office.
C'était juste un jour ordinaire au bureau.
C2 noun /oʊˈbeɪsəns/

obeisance

révérence
Meaning
A gesture of respect such as a bow or curtsy.
Example
They bowed in obeisance to the king.
Ils se sont inclinés en révérence au roi.
B2 adjective + noun ˈɒptɪməl ˈtempərətʃər

optimal temperature

température optimale
Meaning
The best or most favorable temperature for a particular purpose
Example
Winter provides optimal temperature for farming.
L'hiver fournit la température optimale pour l'agriculture.
B2 noun /ɔːrˈɡæn.ɪk ˈfɑːr.mɪŋ/

organic farming

agriculture biologique
Meaning
Farming method that avoids synthetic chemicals and fertilizers, using natural methods instead.
Example
Organic farming improves soil health and reduces pollution.
L'agriculture biologique améliore la santé des sols et réduit la pollution.
C2 noun /ˌɑːbdʒərˈɡeɪʃən/

objurgation

réprimande sévère
Meaning
a harsh scolding or strong rebuke
Example
His misconduct earned him a severe objurgation from the manager.
Sa mauvaise conduite lui a valu une réprimande sévère de la part du responsable.
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.
C2 adjective /ˌoʊdəˈrɪfərəs/

odoriferous

parfumé
Meaning
having or giving off a smell, especially a strong or pleasant one
Example
The garden was filled with odoriferous flowers.
Le jardin était rempli de fleurs parfumées.
B1 adjective /ˈaʊtər/

outer

extérieur
Meaning
situated on or toward the outside; external
Example
The outer layer of the jacket is waterproof.
La couche externe de la veste est imperméable.
B2 noun /ˈɔːkɪstrə/

orchestra

orchestre
Meaning
a large group of musicians playing different instruments together
Example
The orchestra performed beautifully at the concert.
L'orchestre a joué magnifiquement au concert.
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.
C1 noun ɔːrˈdiːl

ordeal

épreuve difficile
Meaning
A physical or mental painful experience that must be endured
Example
Surviving the wilderness was a tough ordeal for them.
Survivre dans la nature a été une épreuve difficile pour eux.
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.
C2 adjective /ɒmˈnɪp.ə.tənt/

omnipotent

omnipotent
Meaning
Having unlimited power; able to do anything; all-powerful.
Example
In many religions, God is considered omnipotent.
Dans de nombreuses religions, Dieu est considéré comme omnipotent.
B2 noun /ɔːˈræŋ.ʊˌtæŋ/

Orang-Outang

orang-outang
Meaning
a large arboreal ape with long reddish hair, long arms, and hooked hands and feet, native to Borneo and Sumatra
Example
The orangutan swings gracefully through the forest canopy.
L'orang-outang se balance gracieusement à travers la canopée de la forêt.
B2 noun /oʊk/

oak

chêne
Meaning
a large tree that produces acorns and has strong, hard wood
Example
The old oak tree provided shade for the entire yard.
Le vieux chêne a fourni de l'ombre à tout le jardin.
C2 adjective /ˌɔːfˈkiː/

off-key

fausse note
Meaning
out of tune; not in accordance with expected standards
Example
The singer was slightly off-key during the performance.
Le chanteur était légèrement hors de ton pendant la performance.
B2 adjective, verb /əbˈskjʊr/

obscure

obscur
Meaning
Not clearly expressed or understood; to make something difficult to see or understand.
Example
The meaning of the poem was obscure to most readers.
La signification du poème était obscure pour la plupart des lecteurs.
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 /ˌɔː.riˈen.təl/

Oriental

relatif aux pays de l'Asie de l'Est; oriental
Meaning
relating to the countries of East Asia; eastern
Example
The museum has a beautiful collection of oriental art.
Le musée possède une belle collection d'art oriental.
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.
C2 noun /ɒkˈteɪvoʊ/

octavo

octavo (taille de livre obtenue en pliant une feuille en huit parties)
Meaning
A size of book page resulting from folding a sheet of paper into eight leaves (sixteen pages).
Example
The old library contained rare octavo editions of Shakespeare.
La vieille bibliothèque contenait des éditions rares en octavo de Shakespeare.
C2 noun (plural) /ˈɔːrdʒiːz/

orgies

orgies
Meaning
Wild gatherings involving excessive indulgence in food, drink, or sexual activity.
Example
The ancient Romans were infamous for their lavish feasts and orgies.
Les anciens Romains étaient infâmes pour leurs festins somptueux et leurs orgies.
C2 noun /ˈəʊpəs/

opus

œuvre créative
Meaning
A creative work, especially a large and important piece of music or art.
Example
The composer considered the symphony his greatest opus.
Le compositeur considérait la symphonie comme sa plus grande œuvre créative.
B2 verb /ɒpt/

opt

choisir
Meaning
to choose or decide to do something instead of something else
Example
Many students opt to study abroad for better opportunities.
De nombreux étudiants choisissent d'étudier à l'étranger pour de meilleures opportunités.