Vestibule (noun)

1. A small entrance hall or porch in a building.
2. An antechamber, hall, or lobby.
3. A small room serving as an antechamber to the main part of a building.
4. A small area at the entrance of a building.
5. A small room or hall located near the entrance of a building.

Origin:

Late 16th century: from latin vestibulum, from vestire "clothe".

Examples:

1. The vestibule of the museum was filled with exhibits.
2. The vestibule was the first room guests saw when entering the building.
3. The vestibule was used as a waiting area.
4. The vestibule was decorated with antique furniture.
5. The vestibule had a grand staircase leading to the second floor.