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a building, part of a building, or outdoor area for housing dramatic performances or stage entertainments, or for showing movies.

the audience at a theatrical performance or movie.

a theatrical or acting company.

a room or hall, fitted with tiers of seats rising like steps, used for lectures, surgical demonstrations, etc..

the theater, dramatic performances as a branch of art; the field or discipline of staged drama.

Often the theater dramatic works collectively, as of literature, a nation, or an author.

the quality or effectiveness of dramatic performance: bad theater;

a place of dramatic action, especially during a war.

a public display of action or speech that gives a false impression of accomplishing or promising something, merely for the sake of appearances (often used in combination): Public health experts have said that the time and money spent on cleaning may be unnecessary hygiene theater. Forget all his blustering about doing what's best for our city—it's just theater to please his union masters and protect his political base.

a natural formation of land rising by steps or gradations.