orthodox
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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.
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.
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 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.
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.
C1 noun /əbˈzɜːvəns/

observance

observance
Meaning
The practice of following a custom, rule, or religious law.
Example
The festival is held in observance of a centuries-old tradition.
Le festival est organisé en observance d'une tradition séculaire.
B2 noun /ˈoʊ.vər ɡroʊθ/

Over growth

surcroissance
Meaning
excessive growth beyond normal size; too much development or expansion
Example
The overgrowth of weeds made the garden look untidy.
La surcroissance des mauvaises herbes a rendu le jardin désordonné.
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.
C1 adjective /əˈblaɪdʒɪŋ/

obliging

serviable
Meaning
Willing to help or do favors; accommodating.
Example
The staff at the hotel were very obliging and friendly.
Le personnel de l'hôtel était très serviable et amical.
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 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 /ˌɔːrθəˈpiːdɪk/

orthopedic

relatif à la correction des déformations osseuses ou musculaires
Meaning
Relating to the correction of deformities of bones or muscles.
Example
She visited an orthopedic surgeon for her back pain.
Elle a consulté un chirurgien orthopédique pour sa douleur au dos.
B2 adjective /ˈɔː.də.li/

Orderly

ordonné; systématique; pacifique
Meaning
well-organized; systematic; peaceful
Example
Please keep your desk orderly and clean.
Veuillez garder votre bureau ordonné et propre.
C1 noun /əˈpreʃ.ən/

Oppression

oppression; abus; tyrannie;
Meaning
cruel or unjust treatment or exercise of authority; the state of being subject to harsh treatment
Example
The people fought against political oppression.
Les gens ont lutté contre l'oppression politique.
B2 noun /əbˈzɜːvər/

observer

observateur
Meaning
a person who watches or notices something
Example
The observer took notes during the meeting.
L'observateur a pris des notes pendant la réunion.
C1 verb /ˈɔːstrəˌsaɪz/

ostracize

ostraciser
Meaning
to exclude someone from a group or society; to banish or shun
Example
After the scandal, he was ostracized by his former colleagues.
Après le scandale, il a été ostracisé par ses anciens collègues.
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.
B1 adjective /ˈɔːɡənaɪzd/

organized

organisé
Meaning
Arranged in a systematic way, especially on a large scale.
Example
An organized approach to work increases productivity and reduces stress.
Une approche organisée du travail augmente la productivité et réduit le stress.
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.
C2 adjective /ɔːrˈθɑːɡənl/

orthogonal

orthogonal
Meaning
at right angles; independent or unrelated
Example
In mathematics, two vectors are orthogonal if their dot product is zero.
En mathématiques, deux vecteurs sont orthogonaux si leur produit scalaire est nul.
B1 noun ˌɒpəˈtjuːnɪtiz

opportunities

opportunités
Meaning
A set of circumstances that makes it possible to do something; chances for advancement or success.
Example
Opportunities for jobs decreased.
Les opportunités d'emploi ont diminué.
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 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.
B2 noun /ˈɔr.fən/

Orphan

orphelin
Meaning
a child whose parents are dead; someone without protective support
Example
The orphan was adopted by a loving family.
L'orphelin a été adopté par une famille aimante.
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 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.
C1 adjective /əbˈstrʌk.tɪv/

Obstructive

obstructif
Meaning
deliberately creating difficulties or preventing progress; hindering or blocking something
Example
The obstructive policies hindered economic growth.
Les politiques obstructives ont entravé la croissance économique.
C1 adjective /ˈɒptɪk/

optic

optique
Meaning
Relating to the eye or vision.
Example
The optic nerve carries signals from the eye to the brain.
Le nerf optique transporte les signaux de l'œil au cerveau.
B2 adjective ˌɒp.ərˈeɪ.ʃən.əl

operational

opérationnel
Meaning
In working order; ready for use.
Example
The space project will be operational by 2025.
Le projet spatial sera opérationnel d'ici 2025.
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 /ˌɒk.sɪ.dʒɪˈneɪ.ʃən/

oxygenation

fourniture ou traitement d'oxygène
Meaning
The process of supplying or treating with oxygen.
Example
Deep breathing exercises improve oxygenation of the body.
Les exercices de respiration profonde améliorent l'oxygénation du corps.
C1 noun /ˌɑːk.sɪˈmɔːr.ɒn/

oxymoron

oxymore
Meaning
a figure of speech where two contradictory terms are combined
Example
The phrase 'deafening silence' is a classic oxymoron.
L'expression 'silence assourdissant' est un oxymore classique.
C1 verb /ˌaʊtˈweɪ/

outweigh

avoir plus de poids
Meaning
To be more important, valuable, or significant than something else.
Example
The benefits of the new policy outweigh the risks.
Les avantages de la nouvelle politique l'emportent sur les risques.
A2 adverb /ˈɒbviəsli/

obviously

évidemment
Meaning
in a way that is easily perceived or understood; clearly
Example
Obviously, he didn’t read the instructions.
Évidemment, il n'a pas lu les instructions.
B2 adverb /ˈɒdli/

oddly

étrangement
Meaning
in a strange or unusual way; unexpectedly
Example
Oddly, he didn’t seem upset by the bad news.
Étrangement, il ne semblait pas bouleversé par la mauvaise nouvelle.
C2 noun /ˈɔɪl.mən/

Oilman

pétrolier
Meaning
a person who works in the oil industry; someone who sells oil or petroleum products
Example
The oilman discovered a new oil field in the desert.
Le pétrolier a découvert un nouveau champ pétrolier dans le désert.
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.
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 noun /əbˈstrʌkʃənɪst/

obstructionist

obstructionniste
Meaning
a person who deliberately delays or prevents progress by being uncooperative or oppositional
Example
The obstructionist in the committee kept delaying the decision-making process.
L'obstructionniste au sein du comite a continue a retarder le processus de prise de decision.
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.
C1 adjective /ˌɒmnɪˈprezənt/

omnipresent

omniprésent
Meaning
(of God) present everywhere at the same time.
Example
Social media has become an omnipresent force in modern society.
Les médias sociaux sont devenus une force omniprésente dans la société moderne.
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.
B2 noun /ˌoʊ.vɚˈkraʊ.dɪŋ/

overcrowding

surpeuplement excessif
Meaning
Excessive crowd or packed condition, having more people or vehicles in a place than the approved capacity.
Example
The subway system suffers from severe overcrowding during peak hours.
Le système de métro souffre de grave surpeuplement pendant les heures de pointe.
C1 noun /ˌɑːsɪˈleɪʃən/

oscillation

oscillation
Meaning
The movement back and forth at a regular speed.
Example
The oscillation of the pendulum controls the clock.
L'oscillation du pendule contrôle l'horloge.
C1 verb ˈɔːr.kɪ.streɪt

orchestrate

orchestrer
Meaning
To plan or coordinate the elements of (a situation) to produce a desired effect, especially surreptitiously.
Example
He skillfully orchestrated the entire event.
Il a habilement orchestré l'ensemble de l'événement.
B2 verb /əˈpoʊz/

oppose

s'opposer
Meaning
to disagree with or resist; to act against
Example
Many citizens oppose the new tax policy.
Beaucoup de citoyens s'opposent à la nouvelle politique fiscale.
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.
A1 preposition /ʌv/

of

de
Meaning
expressing the relationship between a part and a whole
Example
The book is on the table, in front of the window.
Le livre est sur la table, devant la fenêtre.
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.
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.
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.
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.
B1 noun /ˌɑk.jəˈpeɪ.ʃən/

Occupation

occupation; profession; prise de contrôle
Meaning
a job or profession; the action of taking control of a place
Example
Teaching is her chosen occupation.
L'enseignement est sa profession choisie.
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 adjective /ˈəʊ.dər.əs/

Odorous

parfumé; aromatique
Meaning
having a strong smell; fragrant; aromatic
Example
The garden was filled with odorous flowers.
Le jardin était rempli de fleurs parfumées.
C2 verb /əbˈtruːd/

obtrude

intruser
Meaning
to force oneself or one's ideas into a situation uninvited or inappropriately
Example
He didn’t want to obtrude into their private conversation.
Il ne voulait pas intruser dans leur conversation privée.
B2 verb /ˌoʊvərˈsiː/

oversee

superviser
Meaning
to supervise or watch over something; to manage and direct
Example
The manager will oversee the entire construction project.
Le gestionnaire supervisera l'ensemble du projet de construction.
B2 noun /ɒdz/

odds

probabilité
Meaning
the likelihood or probability of something happening; chances for or against something
Example
The odds of winning the lottery are very low.
Les chances de gagner à la loterie sont très faibles.
C1 verb /ˌaʊtˈstrɛtʃ/

outstretch

étendre
Meaning
To extend or stretch something outward.
Example
He outstretched his hand to help her up.
Il a tendu la main pour l'aider à se lever.
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.
C2 noun /oʊˈbleɪʃən/

oblation

oblation
Meaning
a religious offering, especially of bread or wine to God
Example
The priest placed the oblation on the altar during the ceremony.
Le prêtre a placé l'oblation sur l'autel pendant la cérémonie.
B2 noun /ˌɒpəˈzɪʃən/

opposition

opposition
Meaning
the action of opposing or resisting something
Example
The opposition to the new law was strong.
L'opposition à la nouvelle loi était forte.
B2 noun /ˈaʊtlʊk/

outlook

perspective, prévision
Meaning
a person's general attitude or view; a forecast or prospect
Example
The economic outlook for the year is positive.
Les prévisions économiques pour l'année sont positives.
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.
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.
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.
C1 verb /əbˈsɛs/

obsess

obséder
Meaning
To preoccupy or fill the mind of someone continually and to an excessive degree.
Example
She tends to obsess over small details.
Elle a tendance à s'obséder sur de petits détails.
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.
B2 adjective /ˈɒnɡəʊɪŋ/

ongoing

en cours
Meaning
continuing; still in progress
Example
The ongoing project will finish next month.
Le projet en cours sera terminé le mois prochain.
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 adjective /əˈrækjələr/

oracular

oraculaire
Meaning
Resembling an oracle; giving wise, mysterious, or prophetic statements
Example
Her oracular words left the audience deep in thought.
Ses paroles oraculaires ont laissé l'audience profondément pensive.
C1 noun /əˈfen.dər/

Offender

délinquant; infractionniste de la loi
Meaning
a person who commits an illegal act; someone who breaks the law
Example
The young offender was sentenced to community service.
Le jeune délinquant a été condamné à des travaux d'intérêt général.
C2 noun /ˈoʊvərlɔːrd/

overlord

seigneur
Meaning
A ruler, master, or person of great power and authority over others.
Example
The peasants were forced to pay taxes to their overlord.
Les paysans ont été forcés de payer des impôts à leur seigneur.
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.
C1 verb /ˌoʊvərˈʃædoʊ/

overshadow

éclipser
Meaning
to appear more important or significant than something else, reducing its impact
Example
The scandal overshadowed his achievements.
Le scandale a éclipsé ses réalisations.
C1 verb /aʊtˈlæst/

outlast

durer plus longtemps que
Meaning
to continue longer than; to endure beyond someone or something else
Example
The old castle has outlasted many generations.
Le vieux château a duré plus longtemps que de nombreuses générations.
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 /ˈaʊt.breɪk/

Out-break

épidémie
Meaning
a sudden occurrence or eruption of something, especially disease or violence
Example
The outbreak of flu affected many students in the school.
L'épidémie de grippe a touché de nombreux élèves à l'école.
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.
B2 verb /ˌoʊvərˈkʌm/

overcome

surmonter
Meaning
To succeed in dealing with a problem or difficulty.
Example
You can overcome procrastination with planning.
Vous pouvez surmonter la procrastination en planifiant.
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.
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 /ɒpˈtɪʃən/

optician

opticien
Meaning
A person who makes or sells glasses and contact lenses.
Example
The optician adjusted my new glasses to fit better.
L'opticien a ajusté mes nouvelles lunettes pour qu'elles s'ajustent mieux.
A1 verb /ˈoʊpən/

open

ouvrir
Meaning
to move something so as to allow access; to begin
Example
Please open the door for me.
s'il vous plaît ouvrez la porte pour moi.
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.
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 verb /aʊtˈwɪt/

outwit

déjouer
Meaning
to defeat or gain an advantage over someone by being more clever or cunning
Example
The fox managed to outwit the hunters.
Le renard a réussi à duper les chasseurs.
C2 noun /ˈɑːbəlɪsk/

obelisk

obélisque
Meaning
A tall, four-sided, narrow tapering monument with a pyramid-shaped top.
Example
The ancient Egyptians built obelisks to honor their gods.
Les anciens Égyptiens ont construit des obélisques pour honorer leurs dieux.
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.
C2 noun /ˌɒn.əˌmæt.əˈpiː.ə/

onomatopoeia

onomatopée
Meaning
The formation of a word from a sound associated with what is named.
Example
The word 'buzz' is an example of onomatopoeia.
Le mot 'buzz' est un exemple d'onomatopée.
C2 verb /ˈɒsɪfaɪ/

ossify

ossifier
Meaning
to turn into bone or become rigid and inflexible
Example
With age, some tissues tend to ossify.
Avec l'âge, certains tissus ont tendance à s'ossifier.
B2 verb /oʊˈmɪt/

omit

omettre
Meaning
to leave out or exclude; to fail to include something
Example
Please don't omit any important details from your report.
Veuillez ne pas omettre les détails importants dans votre rapport.
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 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 /ˌoʊvərˈpaʊər/

overpower

dominer
Meaning
To defeat or gain control over someone or something by using greater strength or force.
Example
The soldiers managed to overpower the enemy forces.
Les soldats ont réussi à dominer les forces ennemies.
A2 noun /ˈoʊ.ʃən/

ocean

océan
Meaning
A very large expanse of sea, especially the main areas of sea between continents.
Example
The ocean covers more than 70% of the Earth's surface.
L'océan couvre plus de 70% de la surface de la Terre.
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.
C1 verb /aʊst/

oust

évincer
Meaning
To remove someone from a position or place of power or authority.
Example
The rebels ousted the dictator from power.
Les rebelles ont évincé le dictateur du pouvoir.
C1 adjective /ˌəʊ.vərˈɑː.tʃɪŋ/

overarching

global, englobant, tout-en-un
Meaning
Comprehensive or all-embracing; forming an arch over something.
Example
The overarching theme of the book is human resilience.
Le thème global du livre est la résilience humaine.
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 noun /ˈɑn.set/

Onset

début; commencement
Meaning
the beginning or early stages of something; the start of a medical condition
Example
The onset of winter brought heavy snowfall.
Le début de l'hiver a apporté de fortes chutes de neige.
C1 adjective əʊˈpeɪk

opaque

opaque, impénétrable, difficile à comprendre
Meaning
Not able to be seen through; not transparent; difficult to understand.
Example
The glass was too opaque to see through.
Le verre était trop opaque pour voir à travers.
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.
C1 verb /aʊtˈlɪv/

outlive

survivre
Meaning
to live longer than someone or something else
Example
She outlived all her siblings.
Elle a vécu plus longtemps que tous ses frères et sœurs.
C1 adjective /ˈɒptɪməm/

optimum

optimal
Meaning
Most conducive to a favorable outcome; best.
Example
To achieve optimum results, we need to improve efficiency.
Pour obtenir des résultats optimaux, nous devons améliorer l'efficacité.
B2 adjective /aʊtˈstændɪŋ/

outstanding

exceptionnel
Meaning
extremely good or impressive; not yet resolved or paid
Example
She received an award for her outstanding performance.
Elle a reçu un prix pour sa performance exceptionnelle.
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.
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.
B2 noun /ˈaʊt.kʌm/

Outcome

résultat; conséquence;
Meaning
the result or consequence of an action or situation; the final product
Example
The outcome of the election surprised everyone.
Le résultat de l'élection a surpris tout le monde.
C2 noun /ˈɒkjʊlɪst/

oculist

ophtalmologiste
Meaning
An old-fashioned term for an eye doctor or ophthalmologist.
Example
The village oculist was known for treating various eye diseases.
L'oculiste du village était connu pour traiter diverses maladies des yeux.
C1 noun /ˈoʊvərˌtoʊn/

overtone

connotation subtile
Meaning
A subtle quality, implication, or additional meaning beyond the obvious.
Example
His speech had political overtones that were hard to ignore.
Son discours avait des connotations politiques qu'il était difficile d'ignorer.
C2 noun /ˌɔːrdɪˈneɪʃən/

ordination

ordination
Meaning
The ceremony of conferring holy orders or official religious authority.
Example
The church held a special service for the ordination of new priests.
L'église a organisé un service spécial pour l'ordination de nouveaux prêtres.
C1 noun /oʊˈmɪʃ.ən/

Omission

omission; exclusion
Meaning
the action of excluding or leaving out someone or something; a failure to include
Example
The omission of his name from the list was intentional.
L'omission de son nom de la liste était intentionnelle.
C2 noun /ˈoʊdiəm/

odium

odium
Meaning
general or widespread hatred or disgust directed toward someone as a result of their actions
Example
The scandal brought public odium on the corrupt minister.
Le scandale a attiré l'odium public sur le ministre corrompu.
C2 adjective /ˈoʊ.pən ˈhæn.dɪd/

Open-handed

généreux; libéral
Meaning
Generous; liberal; giving freely;
Example
He is very open-handed with his money and always helps those in need.
Il est très généreux avec son argent et aide toujours ceux qui en ont besoin.
C1 adjective /ˌoʊvərˈbɛrɪŋ/

overbearing

autoritaire
Meaning
unpleasantly or arrogantly domineering
Example
His overbearing attitude made everyone uncomfortable.
Son attitude autoritaire a mis tout le monde mal à l'aise.
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.
A2 adjective/adverb /ˈɒnˌlaɪn/

online

en ligne
Meaning
connected to or available through the internet
Example
I prefer shopping online rather than going to stores.
Je préfère faire du shopping en ligne plutôt que d'aller dans les magasins.
C2 adjective /ɑːlˈfæktəri/

olfactory

olfactif
Meaning
Relating to the sense of smell.
Example
The perfume activated her olfactory nerves immediately.
Le parfum a immédiatement activé ses nerfs olfactifs.
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.
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.