Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
aversion [əˈvəːʃən] n неприя́знь f
to have an aversion to sb/sth испы́тывать (impf) неприя́знь к кому́-н/чему́-н
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.