Ante rooms are typically defined as small rooms or spaces that act as an entryway or waiting area before entering the main room or space. Antonyms for ante rooms are typically larger rooms or spaces that do not require an entryway or waiting area. Some possible antonyms for ante rooms might include grand halls, spacious foyers, or expansive entryways. These types of spaces would generally be larger and more open than ante rooms, and would provide a more grand or impressive entrance to the main room or space. Alternatively, antonyms might include smaller, more intimate spaces that do not require a waiting area, such as cozy nooks or private alcoves.