cavity

noun

1. a sizeable hole (usually in the ground)

   noun.object

   Synonyms pit

   Source: WordNet 3.0

2. space that is surrounded by something

   noun.shape

   Synonyms enclosed space

   Source: WordNet 3.0

3. soft decayed area in a tooth; progressive decay can lead to the death of a tooth

   noun.process

   Synonyms caries dental caries tooth decay

   Source: WordNet 3.0

4. (anatomy) a natural hollow or sinus within the body

   noun.body

   Synonyms bodily cavity cavum

   Source: WordNet 3.0

5. Hollowness.

   noun

   Source: webster1913