1. A hollow; a hole.
2. A hollow area within the body: a sinus cavity.
3. A pitted area in a tooth caused by caries.

[French cavité, from Late Latin cavitās, from Latin cavus, hollow.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.