Source : Webster's Revised Unabridged Dictionary (1913)

Antechamber \An"te*cham`ber\, n. [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 : WordNet®

antechamber
     n : a large entrance or reception room or area [syn: {anteroom},
          {entrance hall}, {hall}, {foyer}, {lobby}, {vestibule}]