ETYM Latin, the fore court of a Roman house.
Main courtyardlike room of Roman house; cavity of heart or ear.
1. Any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart).
2. The central area in a building; open to the sky.

The entrance to a home or other building; especially the space inside the entrance.

ETYM Latin vestibulum, of uncertain origin: cf. French vestibule.
Entrance-hall.
Any of various bodily cavities leading to another cavity (as of the ear or vagina).