Definitions from Wiktionary ( )

▸ noun:  A place or building, consisting of a stage and seating, in which an audience gathers to watch plays, musical performances, public ceremonies, and so on.
▸ noun:  A region where a particular action takes place; a specific field of action, usually with reference to war.
▸ noun:  A lecture theatre.
▸ noun:  (medicine) An operating theatre or locale for human experimentation.
▸ noun:  (US) A cinema.
▸ noun:  Drama or performance as a profession or art form.
▸ noun:  Any place rising by steps like the seats of a theater.
▸ noun:  (figurative, derogatory, often following a noun used attributively) A conspicuous but unproductive display of action.

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