1. A fixed, intense dislike; repugnance: formed an aversion to crowds.
2. The cause or object of such a feeling.
3. The avoidance of a thing, situation, or behavior because it has been associated with an unpleasant or painful stimulus.
4. Obsolete. The act of turning away or averting.

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.