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[C or U] the period of time between the late afternoon and going to bed; the eveningShall we go dancing on Saturday night?
We've been out every night this week.
She's a singer in a bar by night and a secretary by day.
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[S] the evening on which a special event happensWhen's the last night of your show?
The first/opening night of her new film 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 recentlyI saw Naomi at the club the other night.
a night out an evening spent at a restaurant, theatre, etc. rather than staying at homeLet's have a night out together on Saturday - we could go dancing.