Synonyms of 'anteroom'
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The foyer is the large area where people meet or wait just inside the main doors of a building such as a theatre, cinema, or hotel.
I went and waited in the foyer.
In a hotel or other large building, the lobby is the area near the entrance that usually has corridors and staircases leading off it.
I met her in the lobby of the museum.
Thesaurus for anteroom from the Collins English Thesaurus
An anteroom is a small room leading into a larger room.