Definition of anteroom noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈæntiruːm//
; NAmE NAmE//ˈæntiruːm//
; BrE BrE//ˈæntirʊm//
; NAmE NAmE//ˈæntirʊm//
(formal antechamber)
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a room where people can wait before entering a larger room, especially in an important public building
See the Oxford Advanced American Dictionary entry: anteroom