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Wordabulary

Word library

8,130 words, searchable by word, definition, part of speech, and CEFR level.

olives Noun A2

Small oval fruits with a bitter taste, eaten or pressed for their oil.

omelette Noun A1

A dish made from beaten eggs cooked flat in a pan, often folded around a filling.

ominous Adjective B1

Suggesting that something bad is about to happen.

omit Verb A2

To leave something out, whether on purpose or by accident.

omniscient narrator Noun B2

A narrator who knows the thoughts, feelings, and background of every character in a story.

omnivore Noun B1

An animal that eats both plants and other animals.

on Preposition A1

Shows that something is touching the top of a surface, or that it is switched to work.

once Adverb A1

One time only, or at some point in the past.

oncology Noun B2

The branch of medicine concerned with the diagnosis and treatment of cancer.

one Noun A1

The number that comes before two, often used to mean a single item.

onerous Adjective C1

Involving a great deal of effort, trouble, or responsibility.

ongoing Adjective B2

Continuing to happen or develop; not yet finished.

onion Noun A1

A round vegetable with a strong smell and taste, made up of many thin layers.

online Adjective A1

Connected to or available through the internet.

only Adverb A1

No more than, or nothing other than.

onomatopoeia Noun B1

A word that imitates the sound it describes, such as 'buzz' or 'sizzle'.

onto Preposition A2

Moving to a position on top of or against a surface.

ontology Noun C1

The branch of philosophy concerned with the nature of being and existence, or, in computing, a formal structure describing the categories and relationships within a subject.

oops Interjection A1

A word said when you notice you've made a small mistake.

opaque Adjective B2

Not letting light through, or, when used figuratively, very difficult to understand or see through.

open Adjective A1

Not closed, allowing entry or access.

open circuit Noun B1

An electric circuit that has a break in it, so current cannot flow all the way round.

opening Noun B2

A gap or hole, or the beginning of an event, or a job vacancy.

operant conditioning Noun B2

A type of learning in which behavior is shaped by its consequences, becoming more or less frequent depending on whether it is rewarded or punished.

operate Verb A2

To work a machine, run a business, or keep something functioning.

operation Noun B1

An organized activity or process, or a surgical procedure, or a way something works.

opine Verb C2

To express an opinion, often at some length.

opinion Noun A2

A person's own view, belief, or judgment about something, which isn't necessarily a fact.

opium trade Noun B2

The historical commerce in opium, especially the trade forced on China by foreign powers in the 19th century.

opponent Noun A2

A person who competes against or disagrees with another in a contest, game, or argument.

opportunistic Adjective B2

Quick to take advantage of a chance to benefit, often in a way that seems selfish or poorly planned in advance.

opportunity Noun B1

A chance to do something that could bring a good result.

oppose Verb B2

To disagree with something and try to prevent or stop it.

opposed Adjective B2

Strongly disagreeing with something, or in conflict with it.

opposite Adjective A1

Completely different from, or facing the other way from, something else.

opposition Noun B1

Strong disagreement with or resistance to a plan or idea, or the main political party that is against the government.

oppression Noun B1

The unjust or cruel use of power to control or mistreat a group of people.

opprobrium Noun C2

Strong public criticism or disgrace resulting from bad behavior.

optical Adjective A2

Relating to sight or to devices that use light, such as lenses.

optical fibre Noun B2

A thin, flexible strand of glass or plastic that carries data as pulses of light.

optimal Adjective B2

The best or most favorable possible under the circumstances.

optimisation Noun B2

The process of making something as effective, efficient, or well-suited to its purpose as possible.

optimistic Adjective B1

Expecting good things to happen and focusing on the positive side of a situation.

optimum Adjective B2

The best or most favorable possible; optimal.

option Noun A2

One of two or more choices available to someone.

opulent Adjective C1

Extremely wealthy, luxurious, and grand in appearance.

or Conjunction A1

Offers a choice between two or more things.

oral history Noun B1

Historical information gathered by recording people's spoken memories and stories.