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.