American Dictionary

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Definition o’clock in American English

o’clock adverb

adverb
/əˈklɑk/
1

used for saying what time it is when a clock shows the exact hour

Example

I have a meeting at three o’clock.

Example

It’s nine o’clock.

Synonyms and related words
2

used for saying that it is time to start drinking gin, wine, etc.

Example

Crack open the chardonnay, it’s wine o’clock.

Example

It’s pretty much never not Pimms o’clock.

Synonyms and related words
Definition o’clock in American English