Pronunciation: (u-vûr'zhun, -shun),[key] —n. 1. a strong feeling of dislike, opposition, repugnance, or antipathy (usually fol. by to): a strong aversion to snakes and spiders. 2. a cause or object of dislike; person or thing that causes antipathy: His pet aversion is guests who are always late. 3. Obs.the act of averting; a turning away or preventing.