theatre, also spelled theater, in dramatic arts, an art concerned almost exclusively with live performances in which the action is precisely planned to create a coherent and significant sense of drama. Though the word theatre is derived from the Greek theaomai, “to see,” the performance itself may appeal either to the ear or to the eye, as is suggested by the interchangeability of the terms spectator (which derives from words meaning “to view”) and audience (which derives from words meaning “to hear”).