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Noun[edit] cavity â(plural cavities) 1  A hole or hollow depression. 2  A hollow area within the body (such as the sinuses). ( dentistry) A soft area in a decayed tooth.
Anatomy. 1  a muscular, membranous or ligamentous wall separating two cavities or limiting a cavity. 2  the partition separating the thoracic cavity from the abdominal cavity in mammals.