Real Dictionary

matinee
countable noun: A matinee is a performance of a play or a showing of a film which takes place in the afternoon.
noun: a daytime, esp afternoon, performance of a play, concert, etc
noun: afternoon performance in a theatre or cinema

matinee in American English
a reception or entertainment held in the daytime; esp., a performance, as of a play, held in the afternoon
noun: an entertainment, esp. a dramatic or musical performance, held in the daytime, usually in the afternoon