overgrazing
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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.
C1 noun /ˌɒbstəˈtrɪʃən/

obstetrician

Geburtshelfer
Meaning
A doctor specializing in pregnancy, childbirth, and women's reproductive health.
Example
The obstetrician monitored the mother’s health throughout the pregnancy.
Der Geburtshelfer überwachte die Gesundheit der Mutter während der Schwangerschaft.
B1 noun /ˌɒpəˈreɪʃən/

operation

operation
Meaning
an act or process of functioning or operating
Example
The hospital performed a successful operation.
Das Krankenhaus führte eine erfolgreiche Operation durch.
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.
A2 noun /ˈɒf.ɪs/

office

Büro
Meaning
a room or building where people work, usually at desks
Example
She left the office early to attend a family event.
Sie verließ das Büro früh, um an einer Familienveranstaltung teilzunehmen.
C2 noun /ˌɒktədʒəˈnɛəriən/

octogenarian

Oktogenarier
Meaning
A person who is between 80 and 89 years old.
Example
The octogenarian still jogs every morning to stay healthy.
Der Oktogenarier joggt immer noch jeden Morgen, um gesund zu bleiben.
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.
C2 noun /ˈoʊdiəm/

odium

Abscheu
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.
Der Skandal brachte öffentliches Odium auf den korrupten Minister.
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.
C1 noun /əˈfen.dər/

Offender

Straftäter; Gesetzesbrecher
Meaning
a person who commits an illegal act; someone who breaks the law
Example
The young offender was sentenced to community service.
Der junge Straftäter wurde zu gemeinnütziger Arbeit verurteilt.
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.
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.
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 /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.
C2 noun ˌɒbfəsˈkeɪʃən

obfuscation

Obfuskation, Verwirrung
Meaning
The action of making something obscure, unclear, or unintelligible.
Example
The obfuscation of the data made it difficult to interpret.
Die Obfuskation der Daten erschwerte deren Interpretation.
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.
C2 noun /ˈɒfərtɔːri/

offertory

Opfergabe
Meaning
The part of a religious service when offerings are collected; the offering itself.
Example
The offertory was taken during the Sunday service.
Die Opfergabe wurde während des Sonntagsgottesdienstes entgegengenommen.
C2 adjective /əbˈstrɛpərəs/

obstreperous

laut und schwer zu kontrollieren
Meaning
Noisy and difficult to control.
Example
The obstreperous students disrupted the class.
Die lauten Studenten störten die Klasse.
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.
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.
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 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.
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.
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.
B2 adjective ɔːrˈɡæn.ɪk

organic

biologisch
Meaning
Produced or involving production without the use of chemical fertilizers, pesticides, or other artificial agents.
Example
Organic farming improves soil health and reduces pollution.
Ökologischer Landbau verbessert die Gesundheit des Bodens und reduziert die Verschmutzung.
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.
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.
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.
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.
C2 adjective /ˈɒfɪʃ/

offish

reserviert
Meaning
Unfriendly, distant, or reserved in manner.
Example
He seemed offish at the party and avoided most conversations.
Er schien auf der Party reserviert zu sein und vermied die meisten Gespräche.
A2 noun /ˈoʊ.nər/

Owner

Eigentümer
Meaning
a person who owns something; someone who has legal possession of property
Example
The owner of the restaurant greeted us warmly.
Der Eigentümer des Restaurants begrüßte uns herzlich.
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.
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.
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.
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 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.
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.
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.
C2 adjective /ˈɒf.biːt/

offbeat

ungewöhnlich
Meaning
Unusual, unconventional, or different from the norm.
Example
She has a very offbeat sense of humor.
Sie hat einen sehr ungewöhnlichen Sinn für Humor.
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.
C1 noun /ˌəʊvərɪksˌplɔɪˈteɪʃən/

overexploitation

Übernutzung
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.
Die Übernutzung natürlicher Ressourcen führt zu Umweltzerstörung.
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.
B2 verb /ˌoʊvərˈtɜrn/

overturn

umkehren / eine Entscheidung aufheben
Meaning
to turn something upside down or to reverse a decision or judgment
Example
The court decided to overturn the previous ruling.
Das Gericht entschied sich, das vorherige Urteil aufzuheben.
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.
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.
A2 adjective /ˈɒb.vi.əs/

Obvious

offensichtlich; leicht zu verstehen
Meaning
easily perceived or understood; clear and apparent to the mind
Example
It was obvious that she was upset about something.
Es war offensichtlich, dass sie über etwas verärgert war.
C1 noun /ˈɒfʃuːt/

offshoot

Abspaltung
Meaning
A branch or result that develops from something larger or more important.
Example
The startup was an offshoot of a major tech company.
Das Startup war eine Abspaltung eines großen Tech-Unternehmens.
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.
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.
B1 noun /ˈɒbstəkəlz/

obstacles

Hindernisse
Meaning
Things that block one's way or prevent or hinder progress.
Example
Obstacles in life can often lead to valuable lessons.
Hindernisse im Leben führen oft zu wertvollen Lektionen.
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.
C1 adjective ˈɒptɪmaɪzd

optimized

optimiert, verbessert, effizienter
Meaning
Made as fully perfect, functional, or effective as possible; improved to achieve maximum efficiency.
Example
The system has been optimized for faster performance.
Das System wurde für eine schnellere Leistung optimiert.
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 /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.
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 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 noun /ˈəʊ.nəs/

onus

Verantwortung
Meaning
A duty or responsibility, especially a heavy one.
Example
The onus is on the government to provide relief to the victims.
Die Verantwortung liegt bei der Regierung, den Opfern Hilfe zu leisten.
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.
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 adjective /ˌɑːpərˈtuːn/

opportune

günstiger Moment
Meaning
Happening at a suitable or convenient time.
Example
She arrived at an opportune moment to help.
Sie kam zu einem günstigen Moment, um zu helfen.
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 /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.
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 /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.
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.
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.
A2 adjective /ˈɔː.dɪ.nər.i/

Ordinary

gewöhnlich; normal; nicht besonders
Meaning
normal; usual; not special
Example
It was just an ordinary day at the office.
Es war einfach ein gewöhnlicher Tag im Büro.
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.
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.
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.
B2 noun /əbˈzɜːvər/

observer

Beobachter
Meaning
a person who watches or notices something
Example
The observer took notes during the meeting.
Der Beobachter machte während des Treffens Notizen.
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.
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 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.
B2 adverb /ˈaʊtraɪt/

Outright

direkt; vollständig; ohne Vorbehalt
Meaning
completely; directly; without reservation or concealment
Example
She rejected the proposal outright.
Sie lehnte den Vorschlag direkt ab.
B2 noun /ˌoʊ.vɚˈkraʊ.dɪŋ/

overcrowding

übermäßige Menschenansammlungen
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.
Das U-Bahn-System leidet während der Hauptverkehrszeiten unter schwerer Überfüllung.
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.
A2 verb /ˈɔːfər/

offer

anbieten
Meaning
to present something for acceptance or rejection; to propose
Example
She offered to help with the project.
Sie bot an, bei dem Projekt zu helfen.
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.
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.
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 verb /əbˈteɪn/

obtain

erhalten
Meaning
to get or acquire something
Example
You need to obtain a visa before traveling abroad.
Du musst ein Visum erhalten, bevor du ins Ausland reist.
A1 adverb /ˈɔːfən/

often

oft
Meaning
frequently, many times
Example
I often visit my grandparents on weekends.
Ich besuche oft meine Großeltern am Wochenende.
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.
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.
C1 noun /ˌoʊvərprəˈdʌkʃən/

overproduction

Überproduktion
Meaning
The act of producing more of something than is needed or can be consumed.
Example
The economic crisis was caused by the overproduction of goods.
Die Wirtschaftskrise wurde durch die Überproduktion von Gütern verursacht.
B1 noun /ˈɔːfɪsər/

officer

Beamter
Meaning
a person in a position of authority, especially in law enforcement
Example
The officer gave him a ticket for speeding.
Der Beamte gab ihm ein Ticket wegen zu schnellen Fahrens.
C2 adjective /ɒmˈnɪp.ə.tənt/

omnipotent

allmächtig
Meaning
Having unlimited power; able to do anything; all-powerful.
Example
In many religions, God is considered omnipotent.
In vielen Religionen wird Gott als omnipotent angesehen.
C2 noun /ˈɒlɪv bɑːb/

Olive barb

Olivenbarbe
Meaning
A small freshwater fish with olive-colored body and barbels
Example
The olive barb is commonly found in South Asian rivers.
Die Olivenbarbe kommt häufig in südasiatischen Flüssen vor.
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 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.
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 /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.
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.
B2 adjective /ˈɒp.ʃən.əl/

Optional

optional
Meaning
not compulsory; left to choice
Example
Wearing a tie is optional for this event.
Das Tragen einer Krawatte ist für diese Veranstaltung optional.
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.
B2 adjective /əˈpəʊzd/

opposed

entgegengesetzt
Meaning
being against or in disagreement with something
Example
She is strongly opposed to animal testing.
Sie ist entschieden gegen Tierversuche.
B2 verb /ˌoʊvərˈteɪk/

overtake

überholen
Meaning
to catch up with and pass someone or something; to surpass
Example
The runner managed to overtake his competitor in the final lap.
Der Läufer konnte seinen Konkurrenten in der letzten Runde überholen.
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 /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.
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.
B2 noun /ˈaʊtˌfɪt/

outfit

Outfit
Meaning
A set of clothes worn together, often for a particular occasion.
Example
She wore a beautiful outfit to the party.
Sie trug ein schönes Outfit zur Party.
C2 verb /əbˈvɜːrt/

obvert

umkehren
Meaning
To turn something so as to face in a different direction; in logic, to convert a proposition by negating both subject and predicate.
Example
The teacher asked the students to obvert the statement for practice.
Der Lehrer bat die Schüler, die Aussage zum Üben zu obvertieren.
A1 adjective /ˈɔːr.ɪndʒ/

Orange

orange
Meaning
having a color between red and yellow like that of a ripe orange fruit
Example
The orange sunset painted the sky magnificently.
Der orange Sonnenuntergang malte den Himmel prächtig.
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.
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.
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.
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.
C1 noun ˌɒb.səˈlɛs.əns

obsolescence

Veralterung
Meaning
The process of becoming obsolete or outdated and no longer used.
Example
The rapid advancement of technology leads to the obsolescence of old devices.
Der schnelle technologische Fortschritt führt zur Veralterung alter Geräte.
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!
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.
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.
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.
B2 noun /ˈoʊ.dər/

Odour

Geruch
Meaning
a distinctive smell, especially an unpleasant one
Example
The odour of fresh bread filled the kitchen.
Der Geruch von frischem Brot füllte die Küche.
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.
B1 adverb /əˈrɪdʒɪnəli/

originally

ursprünglich
Meaning
in the beginning, at first
Example
Originally, she wanted to be a doctor.
Ursprünglich wollte sie Ärztin werden.
A2 adjective /əˈlɪmpɪk/

olympic

olympisch
Meaning
related to the Olympic Games, a major international sporting event
Example
She trained hard to compete in the Olympic Games.
Sie trainierte hart, um an den Olympischen Spielen teilzunehmen.
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.
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 verb /əˈblaɪdʒ/

oblige

verpflichten
Meaning
to compel or require someone to do something; to help or do a favor
Example
I would be happy to oblige you with the information you need.
Ich würde mich freuen, Ihnen die benötigten Informationen zu geben.
B2 adverb /ˈoʊpənli/

Openly

offen; öffentlich
Meaning
in a frank and honest way; without concealment; publicly
Example
She spoke openly about her struggles with mental health.
Sie sprach offen über ihre Kämpfe mit der psychischen Gesundheit.