ANTECHAMBER
anteroom, antechamber, entrance hall, hall, foyer, lobby, vestibule
(noun) a large entrance or reception room or area
Source: WordNet® 3.1
Etymology
Noun
antechamber (plural antechambers)
A small room used as an entryway or reception area to a larger room.
Synonyms
• anteroom
Source: Wiktionary
An"te*cham`ber, n. Etym: [Cf. F. antichambre.]
1. A chamber or apartment before the chief apartment and leading into
it, in which persons wait for audience; an outer chamber. See Lobby.
2. A space viewed as the outer chamber or the entrance to an interior
part.
The mouth, the antechamber to the digestive canal. Todd & Bowman.
Source: Webster’s Unabridged Dictionary 1913 Edition