theater

(noun) a building where theatrical performances or motion-picture shows can be presented. Synonyms: theatre, house. Example: "The house was full."

(noun) the art of writing and producing plays. Synonyms: dramaturgy, dramatic art, dramatics, theatre.

(noun) a region in which active military operations are in progress. Synonyms: field, field of operations, theater of operations, theatre, theatre of operations. Examples: "The army was in the field awaiting action." "He served in the vietnam theater for three years."