theatre
noun
[ ˈθɪətə ]
• a building or outdoor area in which plays and other dramatic performances are given.
• a room or hall for lectures with seats in tiers.
• the area in which something happens.
• "a new theatre of war has been opened up"
Origin:
late Middle English: from Old French, or from Latin theatrum, from Greek theatron, from theasthai ‘behold’.