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"活動中の軍事作戦が進行中の地域野原
例:He served in the Vietnam theater for three years. 彼は3年間ベトナムの戦域で軍隊に勤めた。
the art of writing and producing plays劇を書き制作する芸術芝屋
a building where theatrical performances or motion-picture shows can be presented; "the house was full"演劇や映画が上演される建物芝居小屋