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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.
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 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.
C1 verb /ˈɒp.tɪ.maɪz/

optimize

optimieren
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.
Das Unternehmen arbeitet daran, seine Lieferkette zu optimieren.
C1 noun /əˈkɜr.əns/

Occurrence

Vorkommen
Meaning
an instance or event of something happening; the fact of occurring
Example
The occurrence of earthquakes is common in this region.
Das Vorkommen von Erdbeben ist in dieser Region üblich.
B2 noun /ɔːrˈɡæn.ɪk ˈfɑːr.mɪŋ/

organic farming

biologische Landwirtschaft
Meaning
Farming method that avoids synthetic chemicals and fertilizers, using natural methods instead.
Example
Organic farming improves soil health and reduces pollution.
Biologische Landwirtschaft verbessert die Gesundheit des Bodens und reduziert die Verschmutzung.
C2 adjective /ˈɒsiəs/

osseous

knochig
Meaning
consisting of or turned into bone; bony
Example
The fossil showed osseous structures of the ancient creature.
Das Fossil zeigte ossäre Strukturen des alten Wesens.
B2 noun /ˈaʊtskɜːrts/

outskirts

Vororte der Stadt
Meaning
The outer parts of a town or city, away from the center.
Example
They moved to the outskirts of the city for a quieter life.
Sie zogen in die Vororte der Stadt für ein ruhigeres Leben.
C2 noun /əˈblɪkwɪti/

obliquity

Schiefe
Meaning
Deviation from moral or usual conduct; indirectness or lack of straightforwardness.
Example
The politician was criticized for the obliquity of his answers.
Der Politiker wurde wegen der Schiefe seiner Antworten kritisiert.
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.
C2 verb /əbˈtruːd/

obtrude

aufdrängen
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.
Er wollte nicht in ihr privates Gespräch aufdrängen.
A1 adjective /ˈʌðər/

other

anderer
Meaning
used to refer to something different from the one already mentioned or known
Example
I don't want this one, I will take the other one.
Ich will dieses nicht, ich werde das andere nehmen.
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.
Der Dichter schrieb eine Ode an die Schönheit der Natur.
C1 adjective /əbˈstrʌk.tɪv/

Obstructive

hemmend
Meaning
deliberately creating difficulties or preventing progress; hindering or blocking something
Example
The obstructive policies hindered economic growth.
Die hemmenden Maßnahmen behinderten das Wirtschaftswachstum.
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.
Die Ordinalzahl 'dritte' zeigt die Position in einer Sequenz an.
A1 adverb /ˈɔːfən/

often

oft
Meaning
frequently, many times
Example
I often visit my grandparents on weekends.
Ich besuche oft meine Großeltern am Wochenende.
A1 adjective /oʊˈkeɪ/

ok

in Ordnung
Meaning
used to indicate agreement, approval, or understanding
Example
Okay, let's go to the park.
In Ordnung, lass uns zum Park gehen.
C1 noun ˌoʊ.vɚˈɡreɪ.zɪŋ

overgrazing

Überweidung
Meaning
The practice of allowing livestock to graze to the point of damaging vegetation.
Example
Overgrazing leads to soil erosion and loss of biodiversity.
Überweidung führt zu Bodenerosion und Verlust der Biodiversität.
C2 noun /ˈoʊvərlɔːrd/

overlord

Herrscher
Meaning
A ruler, master, or person of great power and authority over others.
Example
The peasants were forced to pay taxes to their overlord.
Die Bauern wurden gezwungen, Steuern an ihren Herrscher zu zahlen.
B1 noun ˈɒk.sɪ.dʒən

oxygen

Sauerstoff. Ein farb- und geruchloses Gas, das für das Leben unerlässlich ist.
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.
Sauerstoff ist für das Leben wichtig.
A1 adverb /wʌns/

Once

einmal; irgendwann in der Vergangenheit
Meaning
one time only; at some time in the past; formerly
Example
I have been to Paris once in my life.
Ich war einmal in meinem Leben in Paris.
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.
C1 adjective /əbˈnɒkʃəs/

Obnoxious

anstößig
Meaning
extremely unpleasant; offensive; annoying
Example
His obnoxious behavior at the party annoyed everyone.
Sein anstößiges Verhalten auf der Party ärgerte alle.
B2 adverb /əˈfɪʃəli/

officially

offiziell
Meaning
in a formal or authorized way
Example
The building was officially opened by the mayor.
Das Gebäude wurde offiziell vom Bürgermeister eröffnet.
C1 noun /əbˈstrʌkʃən/

obstruction

hindernis
Meaning
Something that blocks or gets in the way; the action of obstructing.
Example
There was an obstruction on the railway track.
Es gab ein Hindernis auf den Gleisen.
C1 noun/verb /ˈoʊvərˌhæŋ/

overhang

Überhang
Meaning
To extend outward and hang over something; a projecting part.
Example
The roof overhang provides shade in the summer.
Das Überhängen des Dachs bietet im Sommer Schatten.
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.
A2 adjective/adverb /ˈɒnˌlaɪn/

online

online
Meaning
connected to or available through the internet
Example
I prefer shopping online rather than going to stores.
Ich kaufe lieber online ein, als in Geschäfte zu gehen.
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.
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 /ˈɒbsɪkwi/

obsequy

Begräbnisritus
Meaning
A funeral rite, usually used in plural form obsequies.
Example
The village gathered for the obsequy of their beloved teacher.
Das Dorf versammelte sich für das Begräbnisritus ihres geliebten Lehrers.
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.
C2 noun /ˌoʊpəˈlɛsəns/

opalescence

Opaleszenz
Meaning
a milky or pearly appearance of a surface like that of an opal
Example
The pearl had a gentle opalescence under the light.
Die Perle hatte eine sanfte Opaleszenz im Licht.
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 /aʊərz/

ours

unser
Meaning
belonging to or associated with us
Example
This victory is ours.
Dieser Sieg gehört uns.
C2 noun /ˈɒrɪz(ə)n/

orison

Gebet
Meaning
a prayer, especially a devout or formal one
Example
He whispered a quiet orison before going to sleep.
Er flüsterte ein stilles Gebet, bevor er ins Bett ging.
B2 noun /ˈɒp.tɪ.mɪ.zəm/

optimism

Optimismus
Meaning
Hopefulness and confidence about the future or the successful outcome of something.
Example
Her optimism helped her overcome difficult times.
Ihr Optimismus half ihr, schwierige Zeiten zu überstehen.
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.
C2 adjective /ˈəʊ.dər.əs/

Odorous

duftend; aromatisch
Meaning
having a strong smell; fragrant; aromatic
Example
The garden was filled with odorous flowers.
Der Garten war voller duftender Blumen.
C2 noun /ˈɒkjʊlɪst/

oculist

Augenarzt
Meaning
An old-fashioned term for an eye doctor or ophthalmologist.
Example
The village oculist was known for treating various eye diseases.
Der Oculist des Dorfes war bekannt für die Behandlung verschiedener Augenkrankheiten.
B1 verb /oʊ/

owe

schulden
Meaning
to be under obligation to pay or repay; to be indebted
Example
I owe my success to my parents' support.
Ich schulde meinen Erfolg der Unterstützung meiner Eltern.
B2 noun /ˈaʊt.saɪ.dər/

Out-sider

Außenseiter
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.
Als Außenseiter fand er es schwierig, ihre Traditionen zu verstehen.
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.
B2 noun /ˈɔɪ.stər/

Oyster

Auster
Meaning
a type of shellfish that can be eaten and sometimes contains pearls
Example
She ordered fresh oysters at the seafood restaurant.
Sie bestellte frische Austern im Meeresfrüchte-Restaurant.
C2 verb /ˈoʊɡəl/

ogle

gierig anschauen
Meaning
To look at someone with obvious sexual interest.
Example
He kept ogling the models on the runway.
Er konnte die Models auf dem Laufsteg nicht aus den Augen lassen.
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.
A2 noun /ˈʌv.ən/

Oven

ofen
Meaning
an enclosed compartment used for heating, baking, or drying food
Example
She baked cookies in the oven for thirty minutes.
Sie backte Kekse im Ofen für dreißig Minuten.
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.
C1 noun /ˈɔːrθədɑːksi/

orthodoxy

Orthodoxie
Meaning
traditional or generally accepted beliefs and practices
Example
The religious leader defended the orthodoxy of the faith.
Der religiöse Führer verteidigte die Orthodoxie des Glaubens.
C1 noun /ˈɑːdəsi/

odyssey

lange Reise
Meaning
a long, adventurous journey; a series of experiences
Example
Her career has been an odyssey of challenges and achievements.
Ihre Karriere war eine Odyssee aus Herausforderungen und Erfolgen.
C1 adjective /əbˈtjuːs/

Obtuse

dumm; stumpf; langsam zu verstehen
Meaning
annoyingly insensitive or slow to understand; lacking in intelligence or perception
Example
He was being deliberately obtuse about the instructions.
Er war absichtlich obtus bezüglich der Anweisungen.
C1 noun /ˈaʊtˌkraɪ/

outcry

Protest
Meaning
A strong expression of public anger or disapproval.
Example
The decision sparked an outcry among the citizens.
Die Entscheidung löste einen Protest unter den Bürgern aus.
B2 noun /oʊˈbiː.di.əns/

Obedience

gehorsam
Meaning
compliance with an order, request, or law; submission to authority
Example
Children should show obedience to their parents.
Kinder sollten ihren Eltern Gehorsam zeigen.
B1 noun ˌɔː.ɡən.aɪˈzeɪ.ʃən

organization

Organisation
Meaning
An organized group of people with a particular purpose, such as a business or government department.
Example
The organization was officially inaugurated in 2024.
Die Organisation wurde 2024 offiziell eingeweiht.
B2 adjective /ˈɔɪl.i/

Oily

ölig; mit Öl bedeckt; fettig
Meaning
covered with oil; containing oil; greasy
Example
Her oily skin needs special care.
Ihre ölige Haut braucht besondere Pflege.
C1 noun /ɔːr/

Oar

Ruder
Meaning
a long pole with a flat blade used to row a boat
Example
He dipped the oar into the water and pulled the boat forward.
Er tauchte das Ruder ins Wasser und zog das Boot vorwärts.
B2 noun/verb /ˈoʊvərˌdoʊs/

overdose

überdosis
Meaning
An excessive and dangerous amount of a drug; to take too much of a substance.
Example
He was rushed to the hospital after a drug overdose.
Er wurde nach einer Drogenüberdosis ins Krankenhaus eingeliefert.
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 /əbˈsɛʃən/

obsession

Besessenheit
Meaning
An idea, thought, or concern that continually preoccupies or intrudes on a person's mind.
Example
His obsession with success drove him to work day and night.
Seine Besessenheit vom Erfolg trieb ihn dazu, Tag und Nacht zu arbeiten.
B2 noun /ˈɔr.fən/

Orphan

Waisenkind
Meaning
a child whose parents are dead; someone without protective support
Example
The orphan was adopted by a loving family.
Das Waisenkind wurde von einer liebevollen Familie adoptiert.
C1 adjective /ˌoʊvərˈrɔt/

overwrought

aufgeregt / übermäßig nervös
Meaning
extremely agitated or nervous; excessively elaborate
Example
She was too overwrought to speak clearly after the accident.
Sie war nach dem Unfall zu aufgeregt, um klar zu sprechen.
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.
B1 verb /əbˈzɜːrv/

observe

beobachten
Meaning
to watch carefully; to notice or perceive something
Example
Scientists observe the behavior of animals in the wild.
Wissenschaftler beobachten das Verhalten von Tieren in der Wildnis.
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.
B2 adjective /ˈɒp.tɪ.məl/

optimal

optimal, am besten
Meaning
Best or most favorable; the most effective under particular conditions.
Example
The optimal temperature for plant growth is around 25°C.
Die optimale Temperatur für das Pflanzenwachstum liegt bei etwa 25°C.
C2 verb /aʊtˈraɪd/

outride

überholen
Meaning
to ride faster, farther, or better than someone else
Example
The young rider managed to outride his competitors in the race.
Der junge Reiter konnte seine Mitbewerber im Rennen überholen.
C1 verb /ˈɒfsɛt/

offset

ausgleichen
Meaning
To counterbalance or compensate for something.
Example
The company's losses were offset by gains in other departments.
Die Verluste des Unternehmens wurden durch Gewinne in anderen Abteilungen ausgeglichen.
B2 adjective /aʊtˈstændɪŋ/

outstanding

herausragend
Meaning
extremely good or impressive; not yet resolved or paid
Example
She received an award for her outstanding performance.
Sie erhielt einen Preis für ihre herausragende Leistung.
C1 noun /ˈaʊtpoʊst/

outpost

außenposten
Meaning
A small military camp or position at some distance from the main force, used especially as a guard.
Example
The soldiers were stationed at a remote outpost.
Die Soldaten wurden an einem abgelegenen Außenposten stationiert.
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.
C2 verb /əˈkluːd/

occlude

verstopfen
Meaning
To block or close up an opening or passage.
Example
The pipe was occluded by mineral deposits.
Das Rohr war durch Mineralablagerungen blockiert.
A2 adverb /ˈɒbviəsli/

obviously

offensichtlich
Meaning
in a way that is easily perceived or understood; clearly
Example
Obviously, he didn’t read the instructions.
Offensichtlich hat er die Anweisungen nicht gelesen.
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.
In der Mathematik sind zwei Vektoren orthogonal, wenn ihr Skalarprodukt null ist.
A2 noun əˈlɪm.pɪk ɡeɪmz

Olympic Games

olympische spiele
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.
Die Olympischen Spiele bringen die besten Athleten der Welt zusammen.
C1 noun /ˈɒstrəsɪzəm/

ostracism

Ostrakismus
Meaning
The act of excluding someone from a group or society.
Example
The student faced ostracism after breaking the rules.
Der Student erlebte Ostrakismus, nachdem er die Regeln gebrochen hatte.
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.
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.
C1 verb /ˌaʊtˈstrɛtʃ/

outstretch

ausstrecken
Meaning
To extend or stretch something outward.
Example
He outstretched his hand to help her up.
Er streckte seine Hand aus, um ihr zu helfen.
C1 adjective /əˈbliːk/

Oblique

schräg; diagonal; indirekt oder ausweichend
Meaning
slanting; diagonal; indirect or evasive
Example
The artist drew an oblique line across the canvas.
Der Künstler zog eine schräge Linie über die Leinwand.
C1 adjective /ˌɒbsəˈliːt/

obsolete

veraltet
Meaning
No longer in use or out of date.
Example
Floppy disks are now completely obsolete.
Floppy-Disks sind jetzt völlig veraltet.
C1 verb /ˈoʊvərˌhɔːl/

overhaul

große Überholung
Meaning
to examine thoroughly and repair or improve something that is worn or ineffective
Example
The company decided to overhaul its outdated computer system.
Das Unternehmen entschied sich, sein veraltetes Computersystem zu überholen.
C1 adjective /ˌaʊtˈspoʊkən/

Outspoken

offen
Meaning
frank; speaking directly
Example
She is known for being outspoken about social issues.
Sie ist dafür bekannt, offen über gesellschaftliche Themen zu sprechen.
C2 noun /ˌɒpəˈrɛtə/

operetta

leichte Oper
Meaning
a short opera with light and humorous themes
Example
The theater staged a famous operetta by Gilbert and Sullivan.
Das Theater inszenierte eine berühmte Operette von Gilbert und Sullivan.
B2 noun oʊˈbiː.sə.t̬i

obesity

Fettleibigkeit
Meaning
The condition of being grossly fat or overweight.
Example
Obesity increases the risk of diabetes and heart disease.
Fettleibigkeit erhöht das Risiko für Diabetes und Herzkrankheiten.
A2 noun /ˈɔr.dər/

Order

Befehl; Reihenfolge
Meaning
a command or instruction; the arrangement of things following a particular sequence
Example
The teacher gave an order to sit down quietly.
Der Lehrer gab einen Befehl, sich ruhig hinzusetzen.
A2 verb /oʊˈbeɪ/

obey

gehorchen
Meaning
to follow orders or instructions; to comply with rules
Example
Children should obey their parents and teachers.
Kinder sollten ihren Eltern und Lehrern gehorchen.
C1 noun /oʊˈmɪʃ.ən/

Omission

Auslassung; Unterlassung
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.
Die Auslassung seines Namens von der Liste war absichtlich.
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 noun /ˈɑn.set/

Onset

Beginn; Auftakt
Meaning
the beginning or early stages of something; the start of a medical condition
Example
The onset of winter brought heavy snowfall.
Der Beginn des Winters brachte starken Schneefall.
B2 noun /ˈɒs.trɪtʃ/

Ostrich

Strauss
Meaning
a large flightless bird native to Africa with long legs and neck
Example
The ostrich is the world's largest bird.
Der Strauss ist der größte Vogel der Welt.
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.
B2 verb /ˌoʊvərˈduː/

overdo

übertreiben
Meaning
to do something too much; to exaggerate or carry to excess
Example
Don't overdo the exercise on your first day at the gym.
Übertreibe das Training am ersten Tag im Fitnessstudio nicht.
C1 verb /aʊst/

oust

verdrängen
Meaning
To remove someone from a position or place of power or authority.
Example
The rebels ousted the dictator from power.
Die Rebellen verdrängten den Diktator von der Macht.
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.
C2 noun /ˈaʊtˌrɪɡər/

outrigger

Stabilisierungsstruktur
Meaning
a projecting structure on a boat, used for stability, or a boat fitted with such support
Example
The fisherman paddled his outrigger canoe across the lagoon.
Der Fischer paddelte sein Outrigger-Kanu über die Lagune.
C2 adjective /ˈɔːrnəri/

ornery

grimmig
Meaning
bad-tempered and combative; stubborn
Example
The ornery old man refused to leave his chair.
Der grimmige alte Mann weigerte sich, seinen Stuhl zu verlassen.
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.
C2 noun /ˈɔɪl.mən/

Oilman

Ölverkäufer
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.
Der Ölverkäufer entdeckte ein neues Ölfeld in der Wüste.
C1 adjective /ˈɒptɪkəl/

optical

optisch
Meaning
related to or used in seeing or sight
Example
The optical illusion fooled everyone at the exhibition.
Die optische Täuschung täuschte alle auf der Ausstellung.
C1 adjective /ˈaʊt.kɑːst/

Outcast

ausgestoßen
Meaning
rejected by society; excluded person
Example
He felt like an outcast in his new school.
Er fühlte sich wie ein Ausgestoßener in seiner neuen Schule.
B1 noun /ˌɒp.əˈtjuː.nə.ti/

opportunity

Gelegenheit
Meaning
A favorable chance or set of circumstances that makes it possible to do something.
Example
She seized the opportunity to study abroad.
Sie ergriff die Gelegenheit, im Ausland zu studieren.
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.
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.
A1 verb /ˈoʊpən/

open

öffnen
Meaning
to move something so as to allow access; to begin
Example
Please open the door for me.
bitte öffne die Tür für mich.
B2 adjective /ˌfæʃ.ənd/

Outdated

veraltet
Meaning
obsolete; no longer current
Example
This computer software is completely outdated.
Diese Software ist vollständig veraltet.
B2 noun /ˈaʊt.breɪk/

Out-break

Ausbruch
Meaning
a sudden occurrence or eruption of something, especially disease or violence
Example
The outbreak of flu affected many students in the school.
Der Ausbruch der Grippe hat viele Schüler in der Schule betroffen.
B2 adjective, verb /əbˈskjʊr/

obscure

dunkel
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.
Die Bedeutung des Gedichts war für die meisten Leser unklar.
C1 noun ˈaʊt.sɔːr.sɪŋ

outsourcing

Auslagerung
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.
Viele Unternehmen nutzen Outsourcing, um die Arbeitskosten zu senken.
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.
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.
C2 noun /ˌɒn.əˌmæt.əˈpiː.ə/

onomatopoeia

Onomatopöie
Meaning
The formation of a word from a sound associated with what is named.
Example
The word 'buzz' is an example of onomatopoeia.
Das Wort 'Summen' ist ein Beispiel für Onomatopöie.
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.
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.
A2 adjective /ɒd/

Odd

seltsam; ungewöhnlich; anders als das, was normal oder erwartet wird
Meaning
strange; unusual; different from what is normal or expected
Example
That's an odd way to solve the problem.
Das ist eine seltsame Art, das Problem zu lösen.
C1 verb /aʊtˈlæst/

outlast

länger überdauern als
Meaning
to continue longer than; to endure beyond someone or something else
Example
The old castle has outlasted many generations.
Das alte Schloss hat viele Generationen überdauert.
C1 noun /oʊˈveɪʃən/

ovation

Beifall
Meaning
an enthusiastic show of approval, especially by clapping hands
Example
The actor received a standing ovation after his performance.
Der Schauspieler erhielt nach seiner Aufführung stehende Ovationen.
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 /əˈprəʊ.bri.əm/

opprobrium

Verachtung, Schande
Meaning
Harsh criticism or public disgrace.
Example
The scandal brought opprobrium on the politician.
Der Skandal brachte Verachtung für den Politiker.
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.
B1 verb অকার্স

occurs

tritt auf
Meaning
Happens or takes place, especially as a result of something.
Example
Snowfall occurs in regions with freezing temperatures.
Schneefall tritt in Regionen mit Temperaturen unter dem Gefrierpunkt auf.