theatre (Noun) — (dramaturgy) a building where theatrical performances or motion-picture shows can be presented. ex. "the theatre was full"
theatre (Noun) — The art of writing and producing plays.
theatre (Noun) — (military) a region in which active military operations are in progress. ex. "he served in the Vietnam theatre for three years" ex. "the army was in the theatre of operations awaiting action"
theatre (Noun) — A room in a hospital equipped for the performance of surgical operations.
theatre (Noun) — A dramatic surprise.
theatre (Noun) — A sensational bit of stagecraft.
theatre (Noun) — A highly successful theatrical production.