Refers to a room at the front of a building or a waiting room before a main room; can be used for a parlor or lobby. The gloss 'anticum' is a rare architectural term.
anterior ventricle
Medical/anatomical term; specifically refers to the anterior ventricle of the brain or heart.
The anterior ventricle is located in the front part of the brain.
The visitor was made to wait in the front room for a while.
Let's meet in the hotel lobby.