overt
All a b c d e f g h i j k l m n o p q r s t u v w x y z
All CEFR A1 A2 B1 B2 C1 C2
Content locale
EN Englisch BN Bengali HI Hindi ES Spanisch FR Französisch DE Deutsch RU Russisch ZH Chinesisch JA Japanisch
All Vocabulary Cards All Vocabularies
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.
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.
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.
B1 adverb /əˈrɪdʒɪnəli/

originally

ursprünglich
Meaning
in the beginning, at first
Example
Originally, she wanted to be a doctor.
Ursprünglich wollte sie Ärztin werden.
C2 adjective /ˈoʊdiəs/

odious

abscheulich
Meaning
extremely unpleasant or repulsive
Example
The dictator was remembered for his odious crimes.
Der Diktator wurde für seine abscheulichen Verbrechen erinnert.
C2 adjective /ˈoʊ.pən ˈhɑrt.ɪd/

Open-hearted

offenherzig; großzügig und aufrichtig; herzlich empfangend;
Meaning
Kind and generous; sincere and honest; warmly receptive;
Example
She welcomed the strangers with an open-hearted smile and invited them for dinner.
Sie begrüßte die Fremden mit einem offenen Lächeln und lud sie zum Abendessen ein.
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.
A1 preposition, adverb /ˈoʊvər/

over

über
Meaning
across, on top of, or beyond
Example
The book is lying over the table.
Das Buch liegt über dem Tisch.
C1 verb əˈblɪt.ə.reɪt

obliterate

vernichten
Meaning
To destroy utterly; wipe out completely, to erase or remove something completely.
Example
The storm obliterated entire villages.
Der Sturm vernichtete ganze Dörfer.
C1 verb /aʊtˈlɪv/

outlive

überleben
Meaning
to live longer than someone or something else
Example
She outlived all her siblings.
Sie hat alle ihre Geschwister überlebt.
C2 adjective /ˈɒpjʊlənt/

opulent

opulent
Meaning
Ostentatiously rich, luxurious, or lavish.
Example
They hosted an opulent wedding with gold decorations.
Sie veranstalteten eine opulente Hochzeit mit goldenen Dekorationen.
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 adjective /ɒmˈnɪv.ər.əs/

Omnivorous

allesfresser
Meaning
eating both plants and animals; feeding on various kinds of food
Example
Bears are omnivorous animals that eat both plants and meat.
Bären sind allesfressende Tiere, die sowohl Pflanzen als auch Fleisch essen.
C1 noun /ˈaʊtˌɡroʊθ/

outgrowth

Auswuchs
Meaning
something that grows out of something else; a natural development or result
Example
The new policy was an outgrowth of years of debate.
Die neue Politik war ein Auswuchs jahrelanger Debatten.
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 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.
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 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 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.
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.
C1 adjective /ˌoʊvərˈbloʊn/

overblown

übertrieben
Meaning
excessively exaggerated or inflated
Example
The controversy was overblown by the media.
Die Kontroverse wurde von den Medien übertrieben dargestellt.
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.
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.
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.
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.
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 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 /ˈɔːrnəmənt/

ornament

Schmuck
Meaning
A decorative object that adds beauty to something.
Example
The Christmas tree was decorated with colorful ornaments.
Der Weihnachtsbaum war mit buntem Schmuck geschmückt.
B2 noun /ˈaʊtlet/

outlet

Auslass
Meaning
a means by which something is released, expressed, or distributed
Example
Art is a great outlet for emotions.
Kunst ist ein großartiger Auslass für Emotionen.
B2 noun ˈaʊt.pʊt

output

produktion
Meaning
The amount of something produced by a person, machine, or industry.
Example
Climate change reduces agricultural output.
Der Klimawandel verringert die landwirtschaftliche Produktion.
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.
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.
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.
C2 adjective /ˌɒbsəˈlɛsnt/

obsolescent

veraltet
Meaning
Becoming outdated or on the way to becoming obsolete.
Example
The obsolescent technology could not compete with modern devices.
Die veraltete Technologie konnte nicht mit modernen Geräten konkurrieren.
C2 adjective /ˌɔːfˈkiː/

off-key

falsch
Meaning
out of tune; not in accordance with expected standards
Example
The singer was slightly off-key during the performance.
Der Sänger war während der Aufführung leicht falsch.
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.
B2 noun /ˈɒfərɪŋ/

offering

Angebot
Meaning
something that is given, especially as a gift or contribution
Example
The company’s latest offering is an eco-friendly car.
Das neueste Angebot des Unternehmens ist ein umweltfreundliches Auto.
B1 adjective, adverb /ˈoʊvərɔːl/

overall

insgesamt
Meaning
in general or as a whole
Example
Overall, the project has been successful.
Insgesamt war das Projekt erfolgreich.
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 /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.
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.
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.
A2 noun /ˈɒm.lət/

Omelet

Omelette
Meaning
a dish made from beaten eggs cooked in a frying pan and often folded around a filling
Example
She made a cheese omelet for breakfast.
Sie machte ein Käseomelette zum Frühstück.
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.
C1 adjective əˈblɪv.i.əs

oblivious

unbewusst
Meaning
Being completely unaware of surrounding events.
Example
He was oblivious to the noise around him while reading.
Er war beim Lesen völlig unbewusst von dem Lärm um ihn herum.
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.
C1 verb /ˌoʊvərˈθroʊ/

overthrow

Glück
Meaning
To remove a leader or government from power, often by force.
Example
The rebels planned to overthrow the corrupt regime.
Sie konnte ihr Glück nicht verbergen, als sie den Preis erhielt.
C1 verb /ˈɔːstrəˌsaɪz/

ostracize

ostracisieren
Meaning
to exclude someone from a group or society; to banish or shun
Example
After the scandal, he was ostracized by his former colleagues.
Nach dem Skandal wurde er von seinen ehemaligen Kollegen ostracized.
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.
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.
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.
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.
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 /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 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.
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.
C2 verb /ˈɑːskjʊleɪt/

osculate

küssen
Meaning
To kiss.
Example
They osculated under the mistletoe during the party.
Sie küssten sich unter dem Mistelzweig während der Party.
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.
B2 noun /ˈoʊ.vər ɡroʊθ/

Over growth

Überwuchs
Meaning
excessive growth beyond normal size; too much development or expansion
Example
The overgrowth of weeds made the garden look untidy.
Der Überwuchs des Unkrauts ließ den Garten ungeordnet erscheinen.
C2 noun (plural) /ˈɔːrdʒiːz/

orgies

Orgien
Meaning
Wild gatherings involving excessive indulgence in food, drink, or sexual activity.
Example
The ancient Romans were infamous for their lavish feasts and orgies.
Die alten Römer waren berüchtigt für ihre prächtigen Festessen und Orgien.
B2 verb /əˈpoʊz/

oppose

opponieren
Meaning
to disagree with or resist; to act against
Example
Many citizens oppose the new tax policy.
Viele Bürger opponieren gegen die neue Steuerpolitik.
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 /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.
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.
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 adverb /ˈaʊtwədli/

Outwardly

äußere Erscheinung; nach außen hin;
Meaning
on the surface; externally; in appearance
Example
Outwardly, he seemed calm, but inside he was nervous.
Äußerlich schien er ruhig zu sein, aber innerlich war er nervös.
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.
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.
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.
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 adjective /ˌoʊvərˈwiːnɪŋ/

overweening

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

overseas

ins Ausland
Meaning
in or to a foreign country across the sea
Example
He went overseas for higher education.
Er ging ins Ausland für höhere Bildung.
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 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.
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.
B2 noun /əˌrɪʒ.əˈnæl.ə.ti/

Originality

Originalität
Meaning
the quality of being novel or unusual; the ability to think independently and creatively
Example
The artist's work showed great originality and creativity.
Das Werk des Künstlers zeigte große Originalität und Kreativität.
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.
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.
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.
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 /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.
B2 noun /ˈaʊtˌbreɪk/

outbreak

Ausbruch
Meaning
a sudden start or occurrence of something unpleasant, like disease or violence
Example
There was an outbreak of flu in the city.
Es gab einen Ausbruch von Grippe in der Stadt.
A1 preposition /ʌv/

of

von
Meaning
expressing the relationship between a part and a whole
Example
The book is on the table, in front of the window.
Das Buch ist auf dem Tisch, vor dem Fenster.
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.
C1 noun əˈblɪv.i.ən

oblivion

Vergessenheit, Zerstörung, Verschwinden
Meaning
The state of being unaware or unconscious of what is happening; complete forgetfulness.
Example
His name faded into oblivion over time.
Sein Name verschwand mit der Zeit in der Vergessenheit.
B2 adjective /ˈɔː.də.li/

Orderly

ordentlich; systematisch; friedlich
Meaning
well-organized; systematic; peaceful
Example
Please keep your desk orderly and clean.
Bitte halten Sie Ihren Schreibtisch ordentlich und sauber.
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.
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 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.
C1 adjective/adverb /ˌɒfˈhænd/

offhand

unüberlegt
Meaning
Without previous thought or preparation; casual and sometimes dismissive.
Example
She gave an offhand reply to his serious question.
Sie gab eine unüberlegte Antwort auf seine ernsthafte Frage.
C2 adjective /ˈoʊ.kən/

oaken

aus Eichenholz
Meaning
made of or resembling oak wood
Example
The villagers gathered around the oaken table in the hall.
Die Dorfbewohner versammelten sich um den Eichentisch in der Halle.
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 pronoun, noun, adjective /wʌn/

one

eins
Meaning
the number equivalent to the sum of zero and one; a single person or thing
Example
Only one student answered the question.
Nur ein Student beantwortete die Frage.
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.
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.
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 /ɒkˈteɪvoʊ/

octavo

Oktavo (Buchgröße, die durch das Falten eines Blattes in acht Teile entsteht)
Meaning
A size of book page resulting from folding a sheet of paper into eight leaves (sixteen pages).
Example
The old library contained rare octavo editions of Shakespeare.
Die alte Bibliothek enthielt seltene Oktavo-Ausgaben von Shakespeare.
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.
C1 verb /ˌaʊtˈweɪ/

outweigh

mehr Gewicht haben
Meaning
To be more important, valuable, or significant than something else.
Example
The benefits of the new policy outweigh the risks.
Die Vorteile der neuen Politik überwiegen die Risiken.
B2 adjective /ˈaʊtˌɡoʊɪŋ/

outgoing

gesellig
Meaning
Friendly and sociable; inclined to mix with others.
Example
He is an outgoing person who loves meeting new people.
Er ist eine gesellige Person, die es liebt, neue Leute zu treffen.
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.
B2 adjective /ˌoʊvərˈwɛlmɪŋ/

overwhelming

überwältigend
Meaning
Very intense; overpowering.
Example
Large tasks can feel overwhelming.
Große Aufgaben können überwältigend wirken.
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 /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 verb /ˌoʊvərˈwɛlm/

overwhelm

überwältigen
Meaning
to overpower someone emotionally or physically; to be too much to handle
Example
She was overwhelmed with gratitude after receiving the help.
Sie war überwältigt von Dankbarkeit, nachdem sie die Hilfe erhalten hatte.
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.
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!
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.
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.
B2 adjective + noun ˈɒptɪməl ˈtempərətʃər

optimal temperature

optimale Temperatur
Meaning
The best or most favorable temperature for a particular purpose
Example
Winter provides optimal temperature for farming.
Der Winter bietet die optimale Temperatur für die Landwirtschaft.
A2 preposition /ˈɒntu/

onto

auf
Meaning
moving to a position on the surface of something
Example
She jumped onto the table to get the book.
Sie sprang auf den Tisch, um das Buch zu holen.
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.
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 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.
B1 adverb /əˈkeɪʒənəli/

Occasionally

gelegentlich; von Zeit zu Zeit;
Meaning
sometimes; from time to time; not regularly
Example
I occasionally visit my grandmother on weekends.
Ich besuche meine Großmutter gelegentlich am Wochenende.
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 /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.
C2 noun /ˈɒlɪv brɑːntʃ/

olive-branch

Olivenzweig
Meaning
A symbol of peace or reconciliation; an offer to end conflict.
Example
He extended an olive-branch to his rival after years of hostility.
Er reichte seinem Rivalen nach Jahren der Feindseligkeit einen Olivenzweig.
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.
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.