great room noun1 •(US, Canada) In many modern homes, a room that combines the roles of several more traditional rooms such as the family room, living room, and study.Its homes are tract mansions and starter castles of 4,000 square feet and upward, featuring two-story entrance halls, great rooms, three- or four-car garages, huge kitchens, spa-sized bathrooms, […] — 2008 formsgreat rooms