night · noun C or U /nɑɪt/Full view
Nouns: night, midnight
Adjectives: overnight
Adverbs: overnight, nightly
night (DARK PERIOD)
A1 the time in every 24 hours when it is dark and people usually sleep
Dictionary examples:

It gets cold at night.

I slept really badly last night.

I spent the night at Ted's.

He took the night ferry/train.

The phone rang in the middle of the night.

They're open from 7 in the morning until 10 o'clock at night.

Learner example:

Cracov is [an] interesing place and look[s] nice at night. (Skills for Life (Entry 1); A1; Polish)

night (EVENING)
A1 the period from the evening to the time when you go to sleep
Dictionary examples:

We're seeing them on Saturday night.

I've been out every night this week.

Did you have a good time last night?

Learner example:

You can go to the disco and dance all night. (Skills for Life (Entry 1); A1; Polish)

a sleepless night
C1 a night when you are not able to sleep
Dictionary example:

He'd spent a sleepless night worrying about his exam.

Learner example:

Most of the rooms we stayed in did not have air-condition[ing], which caused many sleepless nights to the majority of us due to the intense heat. (Certificate in Advanced English; C1; Portuguese)

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