Definition of “o'clock” - English Dictionary

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“o'clock” in British English

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o'clockadverb

uk /əˈklɒk/ us /əˈklɑːk/

A1 used after a number from one to twelve to say the time when it is exactly that hour:

It's two o'clock.
He called me at four o'clock in the morning.

informal humorous used to refer to a time of day when you usually do or have a particular thing:

For many mums, the kids' bedtime is chocolate o'clock.
It's wine o'clock!

More examples

  • Make sure you're there by five o'clock.
  • I always get up at six o'clock.

(Definition of “o'clock” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“o’clock” in American English

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o’clockadverb [ not gradable ]

us /əˈklɑk/

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)

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