Meaning of “afternoon” in the English Dictionary

"afternoon" in British English

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afternoonnoun [ C or U ]

uk /ˌɑːf.təˈnuːn/ us /ˌæf.tɚˈnuːn/

A1 the period that starts at about twelve o'clock or after the meal in the middle of the day and ends at about six o'clock or when the sun goes down:

It was a sunny afternoon.
She works three afternoons a week at the library.
It was on a Saturday afternoon.
My baby usually sleeps in the afternoon.
Let's go to the park this afternoon.
I spoke to her yesterday afternoon.
I'll meet you tomorrow afternoon at about 3.30.
She's coming round on Wednesday afternoon.
He's been in a bad mood all afternoon.
She likes to have an afternoon nap.
We got an early-/mid-/late-afternoon flight.

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afternoonexclamation

uk /ˌɑːf.təˈnuːn/ us /ˌæf.tɚˈnuːn/ informal

a friendly way of greeting someone when you meet them in the afternoon:

Afternoon, Bob!

(Definition of “afternoon” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"afternoon" in American English

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afternoonnoun [ C/U ]

us /ˌæf·tərˈnun/

the period that starts at about twelve o’clock or after the meal in the middle of the day and ends at about six o’clock or when the sun goes down:

[ C ] She works three afternoons a week at the library.
[ U ] My baby usually sleeps in the afternoon.
[ U ] I spoke to her yesterday afternoon.

(Definition of “afternoon” from the Cambridge Academic Content Dictionary © Cambridge University Press)