If you have an aversion to something, you have an intense dislike for it. Commonly it's food, but you could have an aversion to black and white movies, driving with the windows open, or taking calls from salespeople.
An aversion is also the person or thing that is the object of such intense dislike: her aversions included all kinds of vegetables and fruits. This noun is from Latin avertio, ultimately from avertere "to turn away," from the prefix a- "from" plus vertere "to turn." Near synonyms are repugnance and antipathy.