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THE ENGLISH DICTIONARY

English English

CEFR LEVEL

3335 entries have no recorded CEFR level and are included in All.

285 words & expressions

o'clock

word A1

used after a number to specify an exact hour of time

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oak

word A2

a large tree that bears acorns and produces hard, durable timber a large tree that produces acorns and has strong, hard wood

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Oar

word C1

a long pole with a flat blade used to propel and steer a boat through water by manual rowing

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oasis

word B2

a fertile or green spot in a desert, where water is found; a pleasant place of refuge or relief; a fertile spot in a desert where water is found; a pleasant refuge a fertile area in a desert where water is found; a peaceful or pleasant place a fertile spot in a desert where water is found; a pleasant relief

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oath

word B2

a solemn promise or formal declaration, often invoking a deity or moral code

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obey

word B2

to comply with an order, request, or law submitted by an authority

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obfuscate

word C2

To deliberately make something obscure, unclear, or difficult to understand.

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obfuscation

word C2

The action of making something obscure, unclear, or unintelligible.

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object

word B1

a thing that you can see or touch; in grammar, the receiver of an action a thing that can be seen and touched; a thing that can be seen and touched

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objection

word B1

An expression or feeling of disapproval or opposition; a reason for disagreeing.

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objective

word B1

something that you plan to achieve; a goal or aim

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obligation

word B2

an act or course of action to which a person is morally or legally bound; a duty or commitment

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obliterate

word C1

to destroy completely; to remove all traces of something; To destroy utterly; wipe out completely, to erase or remove something completely.; Destroy utterly; wipe out completely.

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Oblivion

word C1

the state of being completely forgotten; unconsciousness; complete forgetfulness

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oblivious

word C1

Not aware of or concerned about what is happening around oneself.

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observation

word B1

the act of watching carefully and noticing details; also a comment based on this the action of watching something carefully; a comment or remark the action or process of observing something carefully in order to gain information; The action of watching something carefully to gain information; a remark or comment.

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observations

word B2

Remarks, data, or notes based on watching, monitoring, or measuring something carefully.

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observe

word B1

to watch carefully and attentively; to notice or perceive something; to watch carefully; to notice or perceive something to watch carefully and attentively

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observe closely

phrase

to watch, inspect, or monitor something with intense concentration, attentiveness, and precision

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observed

word B2

Celebrated, marked, or followed a festival, holiday, or customary practice.

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observer

word B2

a person who watches or notices something, especially professionally a person who watches or notices something

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obsolescence

word C2

the process of becoming outdated and no longer used

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obstacle

word B1

A thing that blocks one's way or prevents or hinders progress; barrier or hurdle.; something that blocks or makes progress difficult; a barrier something that blocks your way or prevents progress

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obstacles

word B1

Things that block one's way or hinder progress.

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Obstinacy

word C2

stubborn refusal to change one's opinion or chosen course of action

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obstinate

word C1

Stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so.

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obtain

word B1

to get or acquire something, especially by effort, request, or purchase

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obviate

word C2

to remove a need or difficulty; to prevent or make unnecessary

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obvious

word B1

easy to see, notice, or understand easily perceived or understood; clear and apparent to the mind easily perceived or understood; clear and apparent

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obviously

word B1

in a way that is clear and easy to see or understand in a way that is easily perceived or understood; clearly

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occasion

word B1

a particular event, time, or celebration

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occasional

word B1

occurring, appearing, or done infrequently and irregularly occurring infrequently or irregularly; happening from time to time happening or done sometimes but not regularly or often

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occasionally

word B1

at infrequent intervals; now and then or from time to time

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occult

word C1

Relating to mysterious, supernatural, or magical powers and practices.

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occupation

word A2

a person's job or regular work a job or profession; the action of taking control of a place a job or profession; the action or state of occupying a place; A job or profession; employment.

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occupy

word B1

to fill, enter, or take up a space, time, or position

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occur

word B1

to happen or take place, especially unexpectedly or as part of a process

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ocean

word B1

a very large expanse of sea, especially one of the main areas into which the sea is divided geographically; A very large expanse of sea, especially the main areas of sea between continents. a very large expanse of sea; a large quantity of something a very large expanse of sea; one of the main areas of sea a large body of salt water that covers most of the Earth's surface

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ocean acidification

word C1

The continuous reduction in pH levels of Earth's oceans caused by the uptake of anthropogenic carbon dioxide from the atmosphere.

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ocean stratification

word C2

The natural division of ocean water into distinct horizontal layers based on density, temperature, or salinity differences.

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