1590-1600; < Latināversiōn- (stem of āversiō), equivalent to āvers(us) turned away (see averse) + -iōn--ion
1. distaste, abhorrence, disgust. Aversion, antipathy, loathing connote strong dislike or detestation. Aversion is an unreasoning desire to avoid that which displeases, annoys, or offends: an aversion to (or toward ) cats. Antipathy is a distaste, dislike, or disgust toward something: an antipathy toward (or for ) braggarts. Loathing connotes a combination of hatred and disgust, or detestation: a loathing for (or toward ) hypocrisy, a criminal.
1650s, "mental attitude of repugnance," from L. aversionem (nom. aversio), noun of action from aversus "turned away, backwards, behind, hostile," pp. of avertere (see avert). Earlier in the lit. sense of "a turning away from" (1590s). Aversion therapy in psychology is from 1950.