∙ 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.
∙ A region where a particular action takes place; a specific field of action, usually with reference to war.
∙ A lecture theatre.
∙ An operating theatre or locale for human experimentation. medicine
∙ A cinema. US
∙ Drama or performance as a profession or artform.