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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.
1. a hollow place or space, or a potential space, within the body or one of its organs. 2. in dentistry, the lesion produced by caries. abdominal cavity the cavity of the body between the diaphragm and pelvis, containing the abdominal organs.. a hollow place or space, or a potential space, within the body or one of its organs. 2. in dentistry, the lesion produced by caries. abdominal cavity the cavity of the body between the diaphragm and pelvis, containing the abdominal organs.