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C2 adjective /ˈɑːsɪˌfaɪd/

ossified

in Knochen verwandelt, starr
Meaning
Turned into bone or become rigid; unwilling to change.
Example
The company had an ossified management structure that resisted innovation.
Das Unternehmen hatte eine starre Managementstruktur, die Innovationen widerstand.
B2 noun ɔːˈɡæn.ɪk fuːdz

organic foods

biologische Lebensmittel
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.
Biologische Lebensmittel sind gesünder als verarbeitete Lebensmittel.
C2 noun /ˈoʊpiət/

opiate

Opiat
Meaning
a drug containing opium or its derivatives, used to relieve pain or cause sleep
Example
The doctor prescribed an opiate to relieve the patient's pain.
Der Arzt verschrieb dem Patienten ein Opiat, um die Schmerzen zu lindern.
B2 verb /ˌoʊvərˈpeɪ/

overpay

überbezahlen
Meaning
To pay more than is necessary or reasonable.
Example
She realized she had overpaid for the concert tickets.
Sie erkannte, dass sie für die Konzertkarten zu viel bezahlt hatte.
B2 noun/verb /ˈaʊtreɪdʒ/

outrage

Empörung
Meaning
A strong feeling of anger and shock; to arouse anger or shock.
Example
The unfair decision caused public outrage.
Die ungerechte Entscheidung verursachte öffentliche Empörung.
B1 noun /aʊl/

Owl

Eule
Meaning
a nocturnal bird of prey with large eyes and a hooked beak
Example
The owl hooted softly in the darkness of the forest.
Die Eule rief leise in der Dunkelheit des Waldes.
B1 noun əbˈdʒek.tɪv

objective

ziel
Meaning
A thing aimed at or sought; a goal.
Example
The main objective is to test sustainability.
Das Hauptziel ist es, die Nachhaltigkeit zu testen.
B2 adverb /ˈɒdli/

oddly

seltsamerweise
Meaning
in a strange or unusual way; unexpectedly
Example
Oddly, he didn’t seem upset by the bad news.
Seltsamerweise schien er über die schlechte Nachricht nicht verärgert zu sein.
C1 verb /aʊtˈwɪt/

outwit

überlisten
Meaning
to defeat or gain an advantage over someone by being more clever or cunning
Example
The fox managed to outwit the hunters.
Der Fuchs konnte die Jäger überlisten.
C1 noun /ˈɒptɪks/

optics

Optik
Meaning
The branch of physics dealing with light and vision.
Example
She studied optics to understand how lenses work.
Sie studierte Optik, um zu verstehen, wie Linsen funktionieren.
B2 noun /ˈaʊtˌsɛt/

outset

Anfang
Meaning
the beginning or start of something
Example
From the outset, the project seemed ambitious but achievable.
Vom Anfang an schien das Projekt ehrgeizig, aber erreichbar.
B2 adverb /ˌoʊvərˈnaɪt/

Overnight

über Nacht; plötzlich; sehr schnell
Meaning
during the night; suddenly; very quickly
Example
The city was transformed overnight.
Die Stadt wurde über Nacht verwandelt.
B2 verb /ˌoʊvərˈlʊk/

overlook

übersehen
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.
Es ist einfach, kleine Details zu übersehen, wenn man in Eile ist.
C2 noun /ˈəʊpəs/

opus

kreatives Werk
Meaning
A creative work, especially a large and important piece of music or art.
Example
The composer considered the symphony his greatest opus.
Der Komponist betrachtete die Sinfonie als sein größtes kreatives Werk.
B2 noun ˈəʊ.və.hed

overhead

Gemeinkosten
Meaning
Ongoing business expenses not directly attributable to creating a product or service.
Example
The company reduced its overhead to increase profits.
Das Unternehmen reduzierte seine Gemeinkosten, um den Gewinn zu steigern.
B2 adjective /ˌɑːp.təˈmɪs.tɪk/

optimistic

optimistisch
Meaning
hopeful and confident about the future
Example
She is optimistic about the success of her new project.
Sie ist optimistisch über den Erfolg ihres neuen Projekts.
A2 noun /ɔɪl/

Oil

Öl
Meaning
a viscous liquid derived from petroleum or plants, used for cooking or fuel
Example
Heat the oil in a pan before adding the vegetables.
Erhitze das Öl in einer Pfanne, bevor du das Gemüse hinzufügst.
B2 verb /oʊˈmɪt/

omit

weglassen
Meaning
to leave out or exclude; to fail to include something
Example
Please don't omit any important details from your report.
Bitte lassen Sie keine wichtigen Details in Ihrem Bericht aus.
A1 pronoun /aʊər/

our

unser
Meaning
belonging to or associated with the speaker and one or more other people
Example
This is our house.
Dies ist unser Haus.
B2 noun ˈɔː.bɪt

orbit

Umlaufbahn
Meaning
The curved path of a celestial object around a star, planet, or moon.
Example
The satellite maintains its orbit around Earth.
Der Satellit hält seine Umlaufbahn um die Erde bei.
C1 adjective /ˌoʊvərˈbɛrɪŋ/

overbearing

überheblich
Meaning
unpleasantly or arrogantly domineering
Example
His overbearing attitude made everyone uncomfortable.
Seine überhebliche Haltung hat alle unwohl gemacht.
C2 noun /oʊˈbleɪʃən/

oblation

Opfergabe
Meaning
a religious offering, especially of bread or wine to God
Example
The priest placed the oblation on the altar during the ceremony.
Der Priester legte die Opfergabe während der Zeremonie auf den Altar.
C1 noun /ˈɑd.ɪ.ti/

Oddity

Seltenheit
Meaning
something that is strange or unusual; a peculiar trait
Example
His habit of sleeping standing up was considered an oddity.
Seine Gewohnheit, im Stehen zu schlafen, wurde als eine Seltenheit betrachtet.
C1 verb /ˌaʊtˈstrɪp/

outstrip

übertreffen
Meaning
To go faster or do better than someone or something; to surpass.
Example
The company outstripped its competitors in sales last year.
Das Unternehmen hat seine Konkurrenten im Verkauf im letzten Jahr übertroffen.
C2 noun /oʊf/

Oaf

eine tollpatschige, dumme oder unsensible Person
Meaning
a clumsy, stupid, or insensitive person
Example
Don't be such an oaf - handle the dishes carefully!
Sei kein Oaf – gehe mit den Tellern vorsichtig um!
A2 adjective /ˈaʊtdɔːr/

outdoor

im Freien
Meaning
situated, existing, or done outside a building
Example
We planned an outdoor picnic for the weekend.
Wir haben ein Picknick im Freien für das Wochenende geplant.
C2 verb /oʊˈpaɪn/

opine

eine Meinung äußern
Meaning
to express an opinion or belief
Example
The professor opined that the policy would fail.
Der Professor äußerte die Meinung, dass die Politik scheitern würde.
C1 noun /oʊˈbɪt.ʃu.er.i/

Obituary

Nachruf
Meaning
a notice of someone's death published in a newspaper; biographical account of deceased person
Example
The newspaper published his obituary yesterday.
Die Zeitung veröffentlichte gestern seinen Nachruf.
A1 pronoun /aʊərz/

ours

unser
Meaning
belonging to or associated with us
Example
This victory is ours.
Dieser Sieg gehört uns.
C1 verb /ɔːrˈdeɪn/

ordain

ordnen
Meaning
To officially make someone a priest or minister; to decree or order something officially.
Example
The bishop will ordain three new priests this Sunday.
Der Bischof wird an diesem Sonntag drei neue Priester ordinieren.
C1 adjective /əˈblɪɡ.ə.tɔː.ri/

obligatory

obligatorisch
Meaning
Required by a legal, moral, or other rule; compulsory.
Example
Wearing a seatbelt is obligatory in most countries.
Das Tragen eines Sicherheitsgurts ist in den meisten Ländern obligatorisch.
C1 noun /ˈoʊvərˌsiːər/

overseer

Aufseher
Meaning
a person who supervises work or workers; a manager
Example
The overseer made sure the workers followed safety rules.
Der Aufseher stellte sicher, dass die Arbeiter die Sicherheitsregeln befolgten.
C1 adjective /ˈɔːrθədɑːks/

orthodox

orthodox
Meaning
conforming to traditional beliefs or practices
Example
He comes from a very orthodox family.
Er stammt aus einer sehr orthodoxen Familie.
C1 verb /ˌoʊvərˈrʌn/

overrun

überwuchern
Meaning
to spread over or occupy completely; to exceed a limit or time
Example
The garden was overrun with weeds.
Der Garten war von Unkraut überwuchert.
A1 conjunction /ɔːr/

or

oder
Meaning
used to link alternatives
Example
You can have tea or coffee.
Du kannst Tee oder Kaffee haben.
C2 noun /ˌɒstɛnˈteɪʃən/

ostentation

Prunk
Meaning
excessive display of wealth or knowledge intended to attract admiration or envy
Example
The billionaire’s party was full of ostentation and luxury.
Die Party des Milliardärs war voller Prunk und Luxus.
C2 noun /ˈɒksɪdənt/

occident

Okzident
Meaning
The countries of the West, especially Europe and America.
Example
The Occident has a long history of philosophical thought.
Der Okzident hat eine lange Geschichte der philosophischen Gedanken.
B1 noun /ˌɑk.jəˈpeɪ.ʃən/

Occupation

Beruf; Beschäftigung; Übernahme
Meaning
a job or profession; the action of taking control of a place
Example
Teaching is her chosen occupation.
Lehren ist ihr gewählter Beruf.
B2 verb /ɒpt/

opt

wählen
Meaning
to choose or decide to do something instead of something else
Example
Many students opt to study abroad for better opportunities.
Viele Studenten entscheiden sich, im Ausland zu studieren, um bessere Möglichkeiten zu haben.
C2 noun /ɔːˈreɪʃən/

oration

Ansprache
Meaning
A formal speech, especially one given on a ceremonial occasion
Example
The president delivered an inspiring oration.
Der Präsident hielt eine inspirierende Ansprache.
C1 adjective /əbˈzɜːrvənt/

Observant

beobachtend
Meaning
quick to notice things; watchful; attentive
Example
The observant detective noticed every small detail at the crime scene.
Der aufmerksame Detektiv bemerkte jedes kleine Detail am Tatort.
C2 noun /ˈɒbsɪkwiːz/

obsequies

Begräbnisriten
Meaning
Funeral rites or ceremonies.
Example
The obsequies for the late leader drew thousands of mourners.
Die Begräbnisriten für den verstorbenen Führer zogen Tausende von Trauergästen an.
C1 adjective ˈɒb.stɪ.nət

obstinate

stur
Meaning
Refusing to change one's mind or accept others' advice easily.
Example
He remained obstinate despite the logical arguments.
Er blieb trotz der logischen Argumente stur.
C1 noun /ˌɒk.sɪ.dʒɪˈneɪ.ʃən/

oxygenation

Sauerstoffversorgung oder -behandlung
Meaning
The process of supplying or treating with oxygen.
Example
Deep breathing exercises improve oxygenation of the body.
Tiefenatmungsübungen verbessern die Sauerstoffversorgung des Körpers.
C1 noun /ˈɔːr.ə.tɔːr.i/

oratory

Rhetorik
Meaning
The art of public speaking; skilled and confident delivery of speeches to an audience.
Example
His exceptional oratory skills won him the debate competition.
Seine außergewöhnlichen oratorischen Fähigkeiten verschafften ihm den Sieg im Debattierwettbewerb.
A1 adjective /əʊˈkeɪ/

okay

in Ordnung
Meaning
used to express agreement or acceptance
Example
It's okay to leave early today.
Es ist in Ordnung, heute früher zu gehen.
C1 noun /oʊθ/

Oath

Eid
Meaning
a solemn promise or declaration; a sworn statement
Example
The doctor took an oath to help patients.
Der Arzt legte ein Eid ab, den Patienten zu helfen.
B2 noun /ˈoʊtˌmiːl/

oatmeal

Haferbrei
Meaning
A type of porridge made from ground oats, often eaten for breakfast.
Example
She eats a bowl of oatmeal every morning for breakfast.
Sie isst jeden Morgen eine Schüssel Haferbrei zum Frühstück.
B2 adverb /ˈəʊvəli/

overly

übermäßig
Meaning
to an excessive degree or extent
Example
She was overly concerned about the results.
Sie war übermäßig besorgt über die Ergebnisse.
B2 noun /ˈɔːɡənɪzəm/

organism

Organismus
Meaning
a living thing that has an organized structure and can grow and reproduce
Example
Every organism needs water to survive.
Jeder Organismus braucht Wasser, um zu überleben.
C2 adjective /ɒˈstɛnsɪv/

ostensive

ostentativ
Meaning
clearly demonstrative or pointing out; explicitly shown
Example
The teacher gave an ostensive example to clarify the concept.
Der Lehrer gab ein ostentatives Beispiel, um das Konzept zu klären.
C1 noun /ɒpˈtɒmɪtrɪst/

optometrist

Optometrist
Meaning
A healthcare professional who examines eyes and prescribes corrective lenses.
Example
The optometrist prescribed new glasses for her.
Der Optometrist verschrieb ihr neue Brillen.
B2 adjective; verb (past participle) /ˈɒkjʊpaɪd/

occupied

besetzt; belegt
Meaning
being in use or taken; filled or lived in; controlled or held by force
Example
The room is occupied, so please wait outside.
Das Zimmer ist besetzt, bitte warten Sie draußen.
C1 noun ˌɒp.tɪ.maɪˈzeɪ.ʃən

optimization

Optimierung
Meaning
Improving processes to increase performance and efficiency.
Example
SEO optimization helps websites rank higher on search engines.
SEO-Optimierung hilft Websites, in Suchmaschinen höher zu ranken.
B2 noun, verb /ˈaʊtlɔː/

outlaw

Gesetzloser
Meaning
as a noun: a person who breaks the law and lives outside its protection; as a verb: to make something illegal
Example
The government decided to outlaw the harmful practice.
Die Regierung hat beschlossen, die schädliche Praxis zu verbieten.
C2 noun /ˌɔːrnɪˈθɑːlədʒi/

ornithology

Ornithologie
Meaning
the scientific study of birds
Example
She pursued ornithology to understand the migration patterns of birds.
Sie verfolgte die Ornithologie, um die Zugmuster der Vögel zu verstehen.
C2 noun /ˈɑːbəlɪsk/

obelisk

obelisk
Meaning
A tall, four-sided, narrow tapering monument with a pyramid-shaped top.
Example
The ancient Egyptians built obelisks to honor their gods.
Die alten Ägypter errichteten Obelisken, um ihre Götter zu ehren.
C1 noun /ˌɑːk.sɪˈmɔːr.ɒn/

oxymoron

Oxymoron
Meaning
a figure of speech where two contradictory terms are combined
Example
The phrase 'deafening silence' is a classic oxymoron.
Der Ausdruck 'ohrenbetäubende Stille' ist ein klassisches Oxymoron.
C1 adjective /ˌɒstɛnˈteɪʃəs/

ostentatious

protzig
Meaning
Characterized by a showy or pretentious display intended to impress others.
Example
He wore an ostentatious gold chain to the party.
Er trug eine protzige goldene Kette zur Party.
C1 noun /ˈɒf.sprɪŋ/

offspring

Nachwuchs
Meaning
a person's child or children; an animal's young
Example
The bird carefully fed its offspring.
Der Vogel fütterte vorsichtig seinen Nachwuchs.
B2 noun ˈɒksɪdʒən prəˈdʌkʃən

oxygen production

Sauerstoffproduktion
Meaning
The process of generating oxygen through photosynthesis or other means.
Example
Plants are vital for oxygen production and the maintenance of life.
Pflanzen sind entscheidend für die Sauerstoffproduktion und den Erhalt des Lebens.
C1 noun /ˈɔːrkɪd/

Orchid

Orchidee
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.
Die weiße Orchidee auf dem Fensterbrett blühte monatelang.
B2 noun/verb /ˌoʊvərˈlæp/

overlap

Überlappung
Meaning
To extend over and cover partly; an area where things coincide.
Example
The two meetings overlap by an hour.
Die beiden Besprechungen überlappen sich um eine Stunde.
B2 noun /ˌɒpəˈzɪʃən/

opposition

Opposition
Meaning
the action of opposing or resisting something
Example
The opposition to the new law was strong.
Die Opposition gegen das neue Gesetz war stark.
C1 verb /ˈɒs.ɪ.leɪt/

oscillate

sich hin und her bewegen oder schwingen zwischen zwei Punkten oder Zuständen
Meaning
To swing or move back and forth between two points or states
Example
The stock market tends to oscillate during uncertain times.
Der Aktienmarkt tendiert dazu, sich in unsicheren Zeiten zu bewegen.
C1 verb /ˌoʊvərˈruːl/

overrule

aufheben
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.
Der Richter hob den Einspruch des Verteidigers auf.
C2 noun /ˈɔː.rɪ.fɪs/

orifice

Öffnung
Meaning
an opening or hole, especially in the body or a device
Example
The medicine was applied through a small orifice in the device.
Das Medikament wurde durch ein kleines Loch im Gerät aufgetragen.
C1 noun /oʊˈeɪ.sɪs/

Oasis

Oase
Meaning
a fertile spot in a desert where water is found; a pleasant refuge
Example
The travelers found an oasis after days in the desert.
Die Reisenden fanden eine Oase nach mehreren Tagen in der Wüste.
B1 verb /əˈkɜːr/

occur

auftreten
Meaning
to happen or take place; to be found or present
Example
The accident occurred at the intersection during rush hour.
Der Unfall trat an der Kreuzung während der Stoßzeit auf.
C2 noun /ɒmˈnɪʃəns/

omniscience

Allwissenheit
Meaning
the state of knowing everything
Example
The novel's narrator has an air of omniscience, revealing every character's thoughts.
Der Erzähler des Romans hat eine Aura von Allwissenheit, indem er die Gedanken jeder Figur offenlegt.
B2 noun /ˈaʊtɪŋ/

outing

Ausflug
Meaning
a short trip or excursion, often for leisure or enjoyment
Example
They had a lovely outing at the beach last weekend.
Sie hatten einen schönen Ausflug zum Strand am letzten Wochenende.
C1 noun /ˈoʊ.mən/

Omen

Vorzeichen für zukünftiges Glück oder Unglück
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.
Viele Menschen betrachten eine schwarze Katze, die ihren Weg kreuzt, als schlechtes Vorzeichen.
C2 noun /ˌɔːrəˈtɔːri.oʊ/

oratorio

religiöse Musikkomposition
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.
Handels 'Messias' ist eines der bekanntesten Oratorien, die je geschrieben wurden.
A1 noun/adjective/adverb /ˌaʊtˈsaɪd/

outside

draußen
Meaning
the external part or surface of something; beyond the boundary
Example
Children were playing outside in the yard.
Kinder spielten draußen im Garten.
C1 adjective /ˈəʊnərəs/

onerous

beschwerlich
Meaning
involving a great deal of effort, difficulty, or burden
Example
Fulfilling the contract proved to be an onerous task for the company.
Die Erfüllung des Vertrags erwies sich als eine beschwerliche Aufgabe für das Unternehmen.
C1 adjective /ɒˈstɛnsəbl/

ostensible

scheinbar
Meaning
stated or appearing to be true, but not necessarily so
Example
His ostensible reason for leaving was illness, but many doubted it.
Sein scheinbarer Grund für das Verlassen war Krankheit, aber viele zweifelten daran.
C2 noun ˈoʊʃən ˌstrætɪfɪˈkeɪʃən

ocean stratification

ozeanische stratifikation
Meaning
The formation of layers in ocean water due to differences in density.
Example
Ocean stratification affects marine biodiversity.
Die Ozeanstratifikation beeinflusst die marine Biodiversität.
C1 noun /ˈɒn.slɔːt/

onslaught

Angriff
Meaning
A fierce or destructive attack.
Example
The village faced an onslaught of enemy forces.
Das Dorf sah sich einem Angriff der feindlichen Truppen gegenüber.
B2 adjective /əˈfen.sɪv/

Offensive

beleidigend; insultierend; aggressiv
Meaning
causing displeasure or resentment; insulting; aggressive
Example
His offensive remarks hurt everyone's feelings.
Seine beleidigenden Bemerkungen verletzten die Gefühle aller.
B2 adjective /ˈɒnɡəʊɪŋ/

ongoing

laufend
Meaning
continuing; still in progress
Example
The ongoing project will finish next month.
Das laufende Projekt wird nächsten Monat abgeschlossen sein.
B2 adjective /ˌoʊvərˈwɛlmɪŋ/

overwhelming

überwältigend
Meaning
Very intense; overpowering.
Example
Large tasks can feel overwhelming.
Große Aufgaben können überwältigend wirken.
A1 adverb /ɔːf/

off

aus
Meaning
away from a place, position, or time; not functioning
Example
He turned off the light before leaving the room.
Er schaltete das Licht aus, bevor er den Raum verließ.
C2 adjective /ɒmˈnɪʃ.ənt/

Omniscient

allwissend
Meaning
having complete knowledge; all-knowing
Example
The narrator in the novel appears to be omniscient, knowing every character's thoughts.
Der Erzähler im Roman scheint omniscient zu sein, da er die Gedanken aller Charaktere kennt.
B2 noun /ˌɑb.lɪˈɡeɪ.ʃən/

Obligation

verpflichtung
Meaning
a duty or commitment; something that must be done legally or morally
Example
Parents have an obligation to care for their children.
Eltern haben die Verpflichtung, sich um ihre Kinder zu kümmern.
B2 adjective /aʊtˈreɪdʒəs/

outrageous

empörend
Meaning
Shockingly bad or excessive; very unusual or amusing.
Example
The comedian told an outrageous joke.
Der Komiker erzählte einen empörenden Witz.
B2 verb /ˌoʊvərˈiːt/

overeat

Glück
Meaning
To eat more food than the body needs.
Example
She tends to overeat when she is stressed.
Sie konnte ihr Glück nicht verbergen, als sie den Preis erhielt.
A2 pronoun /aʊərˈsɛlvz/

ourselves

wir selbst
Meaning
used by the speaker to refer to themselves and one or more others as the object of the verb
Example
We should help ourselves before helping others.
Wir sollten uns selbst helfen, bevor wir anderen helfen.
B1 adjective /ˈaʊtər/

outer

äußeren
Meaning
situated on or toward the outside; external
Example
The outer layer of the jacket is waterproof.
Die äußere Schicht der Jacke ist wasserdicht.
A1 interjection /oʊ/

oh

Oh
Meaning
used to express surprise, realization, or understanding
Example
Oh, I didn't know you were here!
Oh, ich wusste nicht, dass du hier bist!
C1 noun /ˈoʊ.vər spɪl/

Over-spill

Überlauf
Meaning
the overflow of liquid from a container; excess that cannot be contained
Example
The overspill from the river flooded nearby farms.
Der Überlauf des Flusses überflutete nahegelegene Farmen.
C1 adjective /ɔːˈneɪt/

ornate

verziert
Meaning
elaborately or highly decorated
Example
The palace hall was filled with ornate furniture and paintings.
Der Palasthalle war mit verzierten Möbeln und Gemälden gefüllt.
C1 verb ˈɔː.kɪ.streɪ.tɪd

orchestrated

orchestriert
Meaning
Planned or coordinated carefully and deliberately.
Example
The attacks were orchestrated with precision.
Die Angriffe wurden mit Präzision orchestriert.
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.
Das Land wurde von einer wohlhabenden Oligarchie regiert, die alle Ressourcen kontrollierte.
C2 noun /ˈoʊ.kəm/

oakum

alte Tauwerkfasern
Meaning
loose fibers obtained by untwisting old ropes, used for caulking ships
Example
The shipbuilders used oakum to seal the gaps in the wooden planks.
Die Schiffbauer verwendeten Oakum, um die Ritzen in den Holzplanken zu versiegeln.
B2 noun /ˈɒpəreɪtər/

operator

Operator
Meaning
a person who operates equipment, a business, or controls something
Example
The machine operator ensured that everything ran smoothly.
Der Maschinenoperator stellte sicher, dass alles reibungslos lief.
C2 noun /ˈɒb.stɪ.nə.si/

obstinacy

Eigensinn
Meaning
Stubborn refusal to change one's opinion or chosen course of action, despite attempts to persuade one to do so.
Example
His obstinacy made negotiations difficult.
Sein Eigensinn erschwerte die Verhandlungen.
C1 adjective /əbˈdʒek.ʃən.ə.bəl/

Objectionable

anstößig
Meaning
arousing distaste or opposition; unpleasant or offensive
Example
His objectionable behavior made everyone uncomfortable.
Sein anstößiges Verhalten machte alle unwohl.
B2 noun /əˈfens/

Offence

Verstoß; Straftat; Angriff
Meaning
a breach of law or rule; an annoyance or resentment
Example
Stealing is a serious offence punishable by law.
Diebstahl ist ein schweres Vergehen, das gesetzlich bestraft wird.
B2 noun /ɒpˈtɪʃən/

optician

Optiker
Meaning
A person who makes or sells glasses and contact lenses.
Example
The optician adjusted my new glasses to fit better.
Der Optiker passte meine neuen Brillen so an, dass sie besser passten.
C2 adjective /əˈprəʊ.bri.əs/

opprobrious

verachtend
Meaning
Expressing strong criticism or scorn.
Example
He made opprobrious remarks about his opponent.
Er machte verächtliche Bemerkungen über seinen Gegner.
B2 noun /wʌn θɜːd/

one-third

ein Drittel
Meaning
one part of something that is divided into three equal parts
Example
One-third of the class was absent today.
Ein Drittel der Klasse war heute abwesend.
C2 noun /ˈɔːrzmən/

Oarsman

Ruderer
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.
Der erfahrene Ruderer ruderte das Boot über den Fluss.
B2 verb /əˈfend/

offend

beleidigen
Meaning
to cause displeasure or resentment; to hurt someone's feelings
Example
His rude comments offended many people at the meeting.
Seine unhöflichen Kommentare haben viele Menschen bei dem Treffen beleidigt.
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.
Olivenöl gilt als eines der gesündesten Kochöle, die verfügbar sind.
B1 adjective /əˈbiː.di.ənt/

Obedient

gehorsam
Meaning
willing to comply with orders or instructions; submissive
Example
The obedient student always follows the teacher's instructions.
Der gehorsame Schüler folgt immer den Anweisungen des Lehrers.
C1 noun ˌɒk.sɪˈdeɪ.ʃən

oxidation

Oxidation
Meaning
A chemical reaction that involves the combination of a substance with oxygen, often causing deterioration.
Example
Oxidation causes metal surfaces to weaken.
Die Oxidation schwächt Metalloberflächen.
B2 verb əbˈzɜːrvd

observed

begehen
Meaning
To celebrate or keep a religious or other festival.
Example
The day is observed annually to raise awareness.
Der Tag wird jährlich begangen, um Bewusstsein zu schaffen.
C2 adjective /ˌoʊdəˈrɪfərəs/

odoriferous

wohlriechend
Meaning
having or giving off a smell, especially a strong or pleasant one
Example
The garden was filled with odoriferous flowers.
Der Garten war mit wohlriechenden Blumen gefüllt.
C2 adjective /ˈɑːbdjʊrət/

obdurate

unbeugsam
Meaning
Stubbornly refusing to change one's opinion or course of action.
Example
He remained obdurate despite everyone's pleas.
Er blieb unbeugsam trotz aller Bitten.
C1 noun /ˈɔɪntmənt/

ointment

Salbe
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.
Der Arzt verschrieb eine Salbe für die Verbrennung an seinem Arm.
A2 noun /əˈlɪmpɪks/

olympics

Olympische Spiele
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.
Die Olympischen Spiele bringen Athleten aus der ganzen Welt zusammen.
C1 adjective /ˌəʊ.vərˈɑː.tʃɪŋ/

overarching

übergreifend, umfassend, allumfassend
Meaning
Comprehensive or all-embracing; forming an arch over something.
Example
The overarching theme of the book is human resilience.
Das übergeordnete Thema des Buches ist menschliche Resilienz.
C2 adjective /əbˈsiːkwɪəs/

obsequious

kriecherisch
Meaning
Excessively obedient or attentive in a servile way.
Example
The waiter gave an obsequious bow to every customer.
Der Kellner machte eine kriecherische Verbeugung vor jedem Kunden.
A1 noun /ɒkˈtoʊbər/

october

Oktober
Meaning
the tenth month of the year in the Gregorian calendar
Example
The weather becomes cooler in October.
Im Oktober wird das Wetter kühler.
C1 adverb /ˈɒp.tɪ.məl.i/

optimally

optimal
Meaning
In the most effective or efficient way possible.
Example
Tasks should be allocated optimally for maximum output.
Aufgaben sollten optimal für maximale Ergebnisse verteilt werden.
C1 adjective /ˌɔː.riˈen.təl/

Oriental

bezogen auf die Länder Ostasiens; orientalisch
Meaning
relating to the countries of East Asia; eastern
Example
The museum has a beautiful collection of oriental art.
Das Museum hat eine schöne Sammlung orientalischer Kunst.
B1 noun /ˈɑb.stə.kəl/

Obstacle

Hindernis
Meaning
something that blocks or makes progress difficult; a barrier
Example
Bad weather was the main obstacle to our journey.
Schlechtes Wetter war das größte Hindernis für unsere Reise.
C1 verb /əbˈstrʌkt/

obstruct

blockieren
Meaning
to block or hinder progress; to prevent or impede movement
Example
The fallen tree obstructed the road for several hours.
Der gefallene Baum blockierte die Straße mehrere Stunden lang.
C2 noun /ɔːrˈθɑːɡrəfi/

orthography

Orthografie
Meaning
The conventional spelling system of a language.
Example
English orthography can be confusing for learners.
Die englische Orthografie kann für Lernende verwirrend sein.
C1 noun /ˌɑːpərˈtuːnɪst/

opportunist

Opportunist
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.
Er wird als Opportunist gesehen, der immer seine eigenen Interessen an erste Stelle setzt.
B2 noun ˈoʊzoʊn dɪˈpliʃən

ozone depletion

Ozonabbau
Meaning
The reduction in the amount of ozone in the Earth's stratosphere, leading to increased UV radiation.
Example
Ozone depletion increases UV radiation.
Ozonabbau erhöht die UV-Strahlung.