definition of
cavity

[1] #1 cavity n. [pit] a sizeable hole (usually in the ground); "they dug a pit to bury the body". wn

[2] #2 cavity n. [enclosed space] space that is surrounded by something. wn

[3] #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] #4 cavity n. [bodily cavity, cavum] (anatomy) a natural hollow or sinus within the body. wn