Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “o’clock”

o’clock

adverb [not gradable]  /əˈklɑk/ us  
used after a number from one to twelve to state the time: She called at nine o’clock this morning.
(Definition of o’clock from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of o’clock?
Add Cambridge dictionaries to your browser to your website

Word of the Day

blueprint

a photographic copy of an early plan for a building or machine

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More