That which resembles a theater in form, use, or the like; a place rising by steps or gradations, like the seats of a theater.

A place or region where great events are enacted; as, the theater of war.

n. 1. An establishment where one may see plays, ballet etc. This is most certainly not a place to see movies.

tiers or terraces in a hillside, resembling the concave formation of seats in a classical outdoor theatre.

a region in which active military operations are in progress; "the army was in the field awaiting action"; "he served in the Vietnam theater for three years"

a very dangerous place

(Greek theaomai=to behold). In gardens a theatre can be an a place see a theatrical performance or place which is like the set for a play.

Theatre or theater (from French "théâtre", from Greek "theatron", θέατρον, meaning "place of seeing") is the branch of the performing arts concerned with acting out stories in front of an audience using combinations of speech, gesture, mime, puppets, music, dance, sound and spectacle — indeed any one or more elements of the other performing arts. Bernard Beckerman, head of Hofstra University's department of drama, in his book, Dynamics of Drama, defines theatre as what "occurs when one or more human beings, isolated in time and/or space, present themselves to another or others." In addition to the standard narrative dialogue style, theatre takes such forms as opera, ballet, mime, kabuki, puppetry, classical Indian dance, Chinese opera, mummers' plays, Performance Improvisation and pantomime.