ozone depletion
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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.
C1 noun /ˈɒktɪv/

octave

Oktave
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.
Die Stimme eines Sängers konnte leicht die höhere Oktave erreichen.
C1 adjective /ˌɔːrnəˈmɛntl/

ornamental

ornamental
Meaning
Serving as decoration; decorative rather than functional.
Example
The garden was filled with ornamental plants.
Der Garten war mit ornamentalen Pflanzen gefüllt.
B2 noun /ˈaʊt.laɪn/

Outline

Umriss; Entwurf; Skizze
Meaning
a general description or plan showing the essential features of something; the main points
Example
The teacher provided an outline of the course syllabus.
Der Lehrer stellte eine Umriss des Kursplans zur Verfügung.
B2 noun /ɒdz/

odds

Wahrscheinlichkeit
Meaning
the likelihood or probability of something happening; chances for or against something
Example
The odds of winning the lottery are very low.
Die Chancen, im Lotto zu gewinnen, sind sehr gering.
B2 noun /ɑːks/

Ox

Ochse
Meaning
a large strong animal used for pulling heavy loads or plowing fields
Example
The farmer used an ox to plow the field.
Der Bauer benutzte einen Ochsen, um das Feld zu pflügen.
A2 noun /ˈoʊ.ʃən/

ocean

Ozean
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.
Der Ozean bedeckt mehr als 70% der Erdoberfläche.
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.
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.
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.
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.
A2 noun /ˈɒbdʒɪkt/

object

Gegenstand
Meaning
a thing that can be seen and touched
Example
The table is an object in the room.
Der Tisch ist ein Gegenstand im Raum.
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 /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.
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.
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 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.
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.
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.
C2 noun /ˈɔːrdnəns/

ordnance

militärische Ausrüstung
Meaning
Military supplies including weapons, ammunition, and combat equipment.
Example
The army stored ordnance in a secure facility outside the city.
Die Armee lagerte militärische Ausrüstung in einer sicheren Einrichtung außerhalb der Stadt.
B2 noun /ˈɔːrɡənaɪzər/

organizer

Organisator
Meaning
a person who arranges or coordinates activities, events, or groups; a tool or item used to keep things in order
Example
She worked as the main organizer of the international conference.
Sie war die Hauptorganisatorin der internationalen Konferenz.
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.
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.
C1 adjective /ˌɒmnɪˈprezənt/

omnipresent

omnipräsent
Meaning
(of God) present everywhere at the same time.
Example
Social media has become an omnipresent force in modern society.
Soziale Medien sind zu einer omnipräsenten Kraft in der modernen Gesellschaft geworden.
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.
B2 noun /ˌaʊtˈsaɪdə(r)/

outsider

Außenseiter
Meaning
a person who is not accepted as a member of a particular group or community
Example
As a new student, she often felt like an outsider at school.
Als neue Studentin fühlte sie sich oft wie eine Außenseiterin in der Schule.
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.
C1 adjective /ˈɑp.ər.ə.tɪv/

Operative

aktiv; in Kraft; funktionierend; betriebsbereit;
Meaning
Functioning; in effect; working; active;
Example
The new safety protocols became operative immediately after the accident.
Die neuen Sicherheitsprotokolle wurden unmittelbar nach dem Unfall betriebsbereit.
C1 noun /əˈpreʃ.ən/

Oppression

Unterdrückung; Misshandlung; Tyrannei;
Meaning
cruel or unjust treatment or exercise of authority; the state of being subject to harsh treatment
Example
The people fought against political oppression.
Die Menschen kämpften gegen politische Unterdrückung.
C2 verb /ˌaʊtməˈnuːvər/

outmaneuver

geschickt überlisten
Meaning
to gain an advantage over an opponent by skillful or clever action
Example
The smaller company managed to outmaneuver its larger rival.
Das kleinere Unternehmen schaffte es, seinen größeren Konkurrenten geschickt zu überlisten.
C2 adjective /əbˈtruːsɪv/

obtrusive

aufdringlich
Meaning
noticeable in an unpleasant or unwelcome way; intrusive
Example
The advertisement was so obtrusive that it ruined the user’s experience.
Die Werbung war so aufdringlich, dass sie das Benutzererlebnis ruinierte.
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.
A1 preposition /ɒn/

on

auf
Meaning
physically in contact with and supported by a surface
Example
The book is on the table.
Das Buch liegt auf dem Tisch.
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.
C1 noun /əbˈzɜːrvətɔːri/

observatory

observatorium
Meaning
A building equipped for observing astronomical or meteorological events.
Example
The observatory is open to the public on weekends.
Das Observatorium ist am Wochenende für die Öffentlichkeit geöffnet.
C1 adjective /ˌɔːrθəˈpiːdɪk/

orthopedic

bezieht sich auf die Korrektur von Knochen- oder Muskelverformungen
Meaning
Relating to the correction of deformities of bones or muscles.
Example
She visited an orthopedic surgeon for her back pain.
Sie besuchte einen orthopädischen Chirurgen wegen ihrer Rückenschmerzen.
C1 verb /uːz/

ooze

sickern
Meaning
to slowly flow or leak out through small openings or pores
Example
Blood began to ooze from the small cut.
Blut begann aus dem kleinen Schnitt zu sickern.
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.
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.
B2 noun /ˈaʊtˌskɜːrt/

outskirt

der Stadtrand
Meaning
the outer edge or border of a town or city
Example
They built a new factory on the outskirts of the city.
Sie bauten eine neue Fabrik am Stadtrand der Stadt.
C1 adjective /aʊtˈmoʊdɪd/

outmoded

veraltet
Meaning
No longer in fashion or useful; outdated.
Example
That old computer is completely outmoded.
Dieser alte Computer ist völlig veraltet.
C1 verb /ˌoʊvərˈpaʊər/

overpower

überwältigen
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.
Die Soldaten konnten die feindlichen Truppen überwältigen.
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 noun /ˈaʊt.kʌm/

Outcome

Ergebnis; Folge;
Meaning
the result or consequence of an action or situation; the final product
Example
The outcome of the election surprised everyone.
Das Ergebnis der Wahl überraschte alle.
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.
C1 noun /ˈoʊvərˌtʊr/

overture

Vorspiel / Vorschlag
Meaning
An introduction to something more substantial; a proposal or preliminary action.
Example
The peace overture was welcomed by both nations.
Der Friedensvorschlag wurde von beiden Nationen begrüßt.
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.
C2 verb /ˈɒsɪfaɪ/

ossify

verknöchern
Meaning
to turn into bone or become rigid and inflexible
Example
With age, some tissues tend to ossify.
Mit dem Alter neigen einige Gewebe dazu, zu osifizieren.
C2 verb /ˈɔːreɪt/

orate

reden
Meaning
To speak in a formal, often pompous manner
Example
He began to orate at the ceremony.
Er begann, bei der Zeremonie zu reden.
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.
A2 noun /ˈoʊpənɪŋ/

opening

Eröffnung
Meaning
an act or instance of beginning something
Example
The opening of the new store was a huge success.
Die Eröffnung des neuen Geschäfts war ein großer Erfolg.
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.
B1 adjective /əˈfɪʃəl/

official

offiziell
Meaning
relating to or connected with an authority or public office
Example
He is the official spokesperson for the company.
Er ist der offizielle Sprecher des Unternehmens.
C2 noun /ɑːlˈfækʃən/

olfaction

Geruchssinn
Meaning
The sense of smell; the process of detecting and perceiving odors.
Example
Dogs have a highly developed sense of olfaction.
Hunde haben einen sehr gut entwickelten Geruchssinn.
C1 adjective /əbˈsɛsɪv/

obsessive

obsessiv
Meaning
Relating to or characterized by an obsession; thinking about something too much.
Example
He has an obsessive interest in cleanliness.
Er hat ein obsessives Interesse an Sauberkeit.
C2 noun /oʊliˈændər/

Oleander

oleander
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.
Die schönen Oleanderblumen blühten im Garten, trotz ihrer giftigen Natur.
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 /ˈɔːrdɪnəns/

ordinance

verordnung
Meaning
An authoritative rule, law, or decree issued by a city, town, or authority.
Example
The city council passed an ordinance banning smoking in public parks.
Der Stadtrat verabschiedete eine Verordnung, die das Rauchen in öffentlichen Parks verbietet.
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.
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 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.
B1 noun ˌɔː.ɡən.aɪˈzeɪ.ʃənz

organizations

Organisationen
Meaning
Organized groups of people with a particular purpose
Example
Organizations play a key role in policymaking.
Organisationen spielen eine Schlüsselrolle bei der Politikgestaltung.
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.
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.
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.
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.
B1 noun /əˈkeɪ.ʒən/

Occasion

Gelegenheit; besonderer Anlass
Meaning
a particular time or instance of an event; a special celebration
Example
Their wedding was a joyous occasion.
Ihre Hochzeit war eine freudige Gelegenheit.
A1 adverb /aʊt/

out

draußen
Meaning
moving or appearing away from the inside or center; not at home or present
Example
He stepped out of the room quietly.
Er trat leise aus dem Raum.
C2 noun /ˌɑːpərˈtuːnɪzəm/

opportunism

Opportunismus
Meaning
The practice of taking advantage of opportunities regardless of principles or ethics.
Example
His decision was driven by opportunism, not values.
Seine Entscheidung wurde durch Opportunismus motiviert, nicht durch Werte.
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 /ˈɒptɪk/

optic

optisch
Meaning
Relating to the eye or vision.
Example
The optic nerve carries signals from the eye to the brain.
Der optische Nerv überträgt Signale vom Auge zum Gehirn.
B2 noun /ˌɒb.zəˈveɪ.ʃənz/

observations

Beobachtung
Meaning
The action or process of observing something carefully.
Example
Observations of distant galaxies provide new insights.
Beobachtungen von fernen Galaxien liefern neue Einblicke.
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.
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.
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 noun /ˌɑːbdʒərˈɡeɪʃən/

objurgation

strenge Zurechtweisung
Meaning
a harsh scolding or strong rebuke
Example
His misconduct earned him a severe objurgation from the manager.
Sein Fehlverhalten brachte ihm eine strenge Zurechtweisung vom Manager ein.
C2 adjective /ˌoʊvərˈwiːnɪŋ/

overweening

überheblich
Meaning
excessively arrogant or prideful
Example
His overweening pride cost him many friends.
Sein übermäßiger Stolz kostete ihm viele Freunde.
B1 adjective /ˌoʊld ˈfæʃənd/

old-fashioned

altmodisch
Meaning
not modern; belonging to an earlier time
Example
He still wears an old-fashioned hat.
Er trägt immer noch einen altmodischen Hut.
B2 noun /ˈɑp.tə.mɪst/

Optimist

Optimist
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.
Als Optimist glaubte sie immer, dass sich die Dinge verbessern würden.
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 adjective /ˈɒptɪməm/

optimum

optimal
Meaning
Most conducive to a favorable outcome; best.
Example
To achieve optimum results, we need to improve efficiency.
Um optimale Ergebnisse zu erzielen, müssen wir die Effizienz verbessern.
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.
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.
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.
C1 adjective /oʊˈvɜːrt/

overt

offen
Meaning
Done or shown openly; not hidden or secret.
Example
There was an overt display of hostility between the rivals.
Es gab eine offene Darstellung von Feindseligkeit zwischen den Rivalen.
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.
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.
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.
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.
A1 adverb /ˈɔːfən/

often

oft
Meaning
frequently, many times
Example
I often visit my grandparents on weekends.
Ich besuche oft meine Großeltern am Wochenende.
C1 adjective ˈɒk.sɪ.də.tɪv

oxidative

Mit Oxidation verbunden
Meaning
Related to or caused by oxidation, especially cellular damage from free radicals.
Example
Excess stress can lead to oxidative damage in cells.
Übermäßiger Stress kann oxidativen Schaden in Zellen verursachen.
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 /ˈoʊ.pən ˈhæn.dɪd/

Open-handed

großzügig; liberal
Meaning
Generous; liberal; giving freely;
Example
He is very open-handed with his money and always helps those in need.
Er ist sehr großzügig mit seinem Geld und hilft immer den Bedürftigen.
C1 noun /ˈaʊtriːtʃ/

outreach

Erweiterung der Hilfe
Meaning
The act of providing services or support to people who might not otherwise have access to them.
Example
The charity launched a new outreach program for the homeless.
Die Wohltätigkeitsorganisation startete ein neues Programm zur Erweiterung der Hilfe für Obdachlose.
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.
C2 adjective /ˈoʊ.vɔɪd/

ovoid

eiförmig
Meaning
egg-shaped; resembling an oval or ellipse
Example
The artist painted an ovoid shape in the center of the canvas.
Der Künstler malte eine eiförmige Form in die Mitte der Leinwand.
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 ˈɒpjʊləns

opulence

Opulenz
Meaning
Great wealth or luxuriousness.
Example
The opulence of the mansion was evident in its ornate furnishings.
Die Opulenz des Herrenhauses war in seiner verzierenden Einrichtung offensichtlich.
C2 noun /ɒmˈnɪpətəns/

omnipotence

Omnipotenz
Meaning
The quality of having unlimited power or authority.
Example
Many religions describe God’s omnipotence as absolute.
Viele Religionen beschreiben die Omnipotenz Gottes als absolut.
B2 noun /ˌɑb.zɚˈveɪ.ʃən/

Observation

Beobachtung
Meaning
the action of watching something carefully; a comment or remark
Example
The scientist made careful observations of the experiment.
Der Wissenschaftler machte sorgfältige Beobachtungen des Experiments.
C2 noun /ˈɔːfəl/

offal

Innereien
Meaning
the internal organs and entrails of an animal used as food; waste parts
Example
The butcher prepared sausages using pork offal.
Der Metzger bereitete Würste mit Schweineinnereien zu.
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.
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.
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.
C2 adjective /ɑːlˈfæktəri/

olfactory

olfaktorisch
Meaning
Relating to the sense of smell.
Example
The perfume activated her olfactory nerves immediately.
Das Parfüm aktivierte sofort ihre Riechnerven.
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.
C2 noun /əbˈstɛtrɪks/

obstetrics

Geburtskunde
Meaning
The branch of medicine dealing with childbirth and care of women giving birth.
Example
She is studying obstetrics to become a specialist in childbirth.
Sie studiert Geburtskunde, um eine Spezialistin für Geburtshilfe zu werden.
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.
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.
C2 adjective /ˈɔːrəˌtʌnd/

orotund

volle und klare Stimme
Meaning
full, rich, and clear in sound; pompous in style
Example
The actor's orotund voice filled the theater.
Die orotunde Stimme des Schauspielers füllte das Theater.
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.
B2 verb /ˌoʊvərˈloʊd/

overload

überladen
Meaning
to load with too much weight or cargo; to give too much work or information
Example
Don't overload the washing machine or it might break down.
Überlade die Waschmaschine nicht, sonst könnte sie kaputt gehen.
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 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.
B1 adverb /ˈʌðərwaɪz/

Otherwise

anders; sonst
Meaning
in a different way; if not; or else; apart from that
Example
Study hard, otherwise you will fail the exam.
Lerne hart, sonst fällst du durch die Prüfung.
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.
A2 noun /ˈɒpərə/

opera

Oper
Meaning
a dramatic performance in which the actors sing most of their lines
Example
We watched a beautiful opera at the theater last night.
Wir haben gestern Abend im Theater eine schöne Oper gesehen.
B1 adverb /əˈrɪdʒɪnəli/

originally

ursprünglich
Meaning
in the beginning, at first
Example
Originally, she wanted to be a doctor.
Ursprünglich wollte sie Ärztin werden.
B2 noun /ˈɒkjʊpənt/

occupant

insasse
Meaning
A person who resides in or is present in a house, vehicle, seat, or place.
Example
The car had three occupants at the time of the accident.
Das Auto hatte drei Insassen zum Zeitpunkt des Unfalls.
C1 noun /ˈɔr.ə.tər/

Orator

Redner
Meaning
a public speaker, especially one who is eloquent or skilled in speaking
Example
The famous orator delivered an inspiring speech.
Der berühmte Redner hielt eine inspirierende Rede.
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.