What is the term for the entranceway in a Roman house?

The term for the entranceway in a Roman house is "vestibulum." This space served as a transition area between the outside world and the home, typically structured as a covered entryway that provided some protection from the elements. The vestibulum often functioned as a space where guests could wait before entering the main house, making it an important element of Roman domestic architecture.

In contrast, the triclinium refers to the dining room where Romans would recline to eat, while the tablinum is the room used for business and family gatherings that typically opens up to the atrium. The atrium itself is an essential part of a Roman house, functioning as a central reception area with an open roof, but it is distinct from the vestibulum, which specifically pertains to the entrance.