Refers to a building or venue for plays, movies, or performances. Common in compounds like シネマシアター (cinema theater) or ホームシアター (home theater).
新しいシアターで映画を見た。
I watched a movie at the new theater.
この街には小さいシアターがたくさんある。
There are many small theaters in this town.
On the weekend, I watched a new movie at the theater with a friend.
I reserved theater tickets for a birthday.
dinner theater; supper club
drive-in theater; drive-in cinema