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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.
n. 1  A small cavity in a rock or vein, often with a mineral lining of different composition from that of the surrounding rock. 2  a small cavity in a rock or vein, often lined with crystals.