cavity

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cav|ity /k'ævɪti/ (cavities)
1 [N-COUNT]
A cavity is a space or hole in something such as a solid object or a person's body. (FORMAL)
2 [N-COUNT]
In dentistry, a cavity is a hole in a tooth, caused by decay. (TECHNICAL)cav|ity wall (cavity walls)
[N-COUNT] oft N n
A cavity wall is a wall that consists of two separate walls with a space between them. Cavity walls help to keep out noise and cold. (mainly BRIT)
...cavity wall insulation.

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