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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.
Full Definition of CAVE. 1. : a natural chamber or series of chambers in the earth or in the side of a hill or cliff. 2.See cave defined for English-language learners. cave. noun \ËkÄv\. Tweet. : a large hole that was formed by natural processes in the side of a cliff or hill or under the ground.