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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.
body cavity, any of the spaces in the human body that contain organs. One major cavity, the thoracic cavity, is subdivided into a pericardial and two pleural cavities. Any space in the body that does not freely communicate with the outside.