Meaning of “theatre” - Learner’s Dictionary

theatre

noun UK (US theater) uk us /ˈθɪətər/
BUILDING WITH STAGE [ C ]

A2 a building with a stage where people go to watch plays:

the Arts Theatre
BUILDING FOR FILMS [ C ] US

a building where people go to watch films:

a movie theater
WORK [ U ]

the work of writing, acting in, and producing plays:

I want to work in theatre.
MEDICAL [ C, U ] UK

a room in a hospital where doctors do operations

(Definition of “theatre” from the Cambridge Learner’s Dictionary © Cambridge University Press)