Etymology
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cavity (n.)

"a hollow place, empty space in the body," 1540s, from French cavité (13c.), from Late Latin cavitatem (nominative cavitas) "hollowness," from Latin cavus "hollow" (from PIE root *keue- "to swell," also "vault, hole").

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Definitions of cavity

cavity (n.)
a sizeable hole (usually in the ground);
Synonyms: pit
cavity (n.)
space that is surrounded by something;
Synonyms: enclosed space
cavity (n.)
soft decayed area in a tooth; progressive decay can lead to the death of a tooth;
Synonyms: caries / dental caries / tooth decay
cavity (n.)
(anatomy) a natural hollow or sinus within the body;
Synonyms: bodily cavity / cavum
From wordnet.princeton.edu