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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.
A wall formed of two thicknesses of masonry with a space between them. Classified under: Nouns denoting man-made objects. Hypernyms (cavity wall is a kind of...): wall (an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure).