#1 cavity n. [pit] a sizeable hole (usually in the ground); "they dug a pit to bury the body". wn
#2 cavity n. [enclosed space] space that is surrounded by something. wn
#3 cavity n. [caries, dental caries, tooth decay] soft decayed area in a tooth; progressive decay can lead to the death of a tooth. wn
#4 cavity n. [bodily cavity, cavum] (anatomy) a natural hollow or sinus within the body. wn
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