antechamber

ante- +‎ chamber

• (UK) IPA^(key): /ˈæn.tiˌt͡ʃeɪm.bə/, /ˈæn.tɪˌt͡ʃeɪm.bə/
• (US) IPA^(key): /ˈæn.tiˌt͡ʃeɪm.bɚ/

• Audio (US)

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antechamber (plural antechambers)

1. A small room used as an entryway or reception area to a larger room.
   • 2005 July 16, J. K. Rowling [pseudonym; Joanne Rowling], Harry Potter and the Half-Blood Prince (Harry Potter; 6), London: Bloomsbury Publishing, →ISBN:

     "This is merely the antechamber, the entrance hall," said Dumbledore after a moment or two.

• anteroom