1. 【英】= theater

n.

1. a building in which plays and other dramatic performances are given.
   ▸chiefly N. Amer. & W. Indian a cinema.
2. the writing and production of plays.
3. a play or other activity considered in terms of its dramatic quality.
4. (also lecture theatre) a room for lectures with seats in tiers.
5. Brit. an operating theatre.
6. the area in which something happens:
   a theatre of war.
   ▸ [as modifier] denoting weapons intermediate between tactical and strategic.