Meaning of “night” in the English Dictionary

"night" in British English

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nightnoun

uk /naɪt/ us /naɪt/

night noun (DARK PERIOD)

A1 [ C or U ] the part of every 24-hour period when it is dark because there is very little light from the sun:

It gets cold at night.
I slept really badly last night.
I spent the night at Ted's.
He took the night ferry/train.

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night noun (EVENING)

A1 [ C or U ] the period of time between the late afternoon and going to bed; the evening:

Let's go out on Saturday night.
We've eaten out every night this week.
She's a singer in a bar by night and a secretary by day.

[ S ] the evening on which a special event happens:

When's the last night of your show?
The first/opening night of her new movie was a great success.
night-night child's expression

used as another way of saying good night, usually by or to children

the other night

on one evening recently:

I saw Naomi at the gym the other night.
a night out

an evening spent at a restaurant, theatre, etc. rather than staying at home:

I need a night out with the girls this weekend.
UK Let's have a night out on Saturday.

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nightexclamation

uk /naɪt/ us /naɪt/ informal

a friendly way of saying goodbye when you leave someone in the evening or before going to bed or to sleep:

Night, sweetheart! Sleep well!
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(Definition of “night” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"night" in American English

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nightnoun [ C/U ]

us /nɑɪt/

the part of every 24-hour period when it is dark because there is no direct light from the sun:

[ C ] I’ll be in Pittsburgh on Tuesday night.
[ C ] There was a fire last night in the Tremont section of the Bronx.
[ U ] It often gets cold here at night.

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