a building where theatrical performances or motion-picture shows can be presented
The house was full.
source: WordNet 3.0
the art of writing and producing plays
source: WordNet 3.0
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.
source: WordNet 3.0
An edifice in which dramatic performances or spectacles are exhibited for the amusement of spectators; anciently uncovered, except the stage, but in modern times roofed.