The Latin word refers to a living room typical of Roman houses, with characteristics of quality, location and decoration, which differentiate it from the common rooms.
The Diæta is present in domus or villas belonging to high social classes, it could have been a room for resting or dining or even a living room to entertain guests, probably furnished with klinai or couches, also enriched with works of art, more refined mosaic and wall decorations.