An Etymological Dictionary of Astronomy and Astrophysics

1. Of different kinds, as two or more things; differing one from another.
   

2. Marked by or exhibiting variety or diversity (Dictionary.com).

Etymology (EN): M.Fr. varieux and directly from L. varius “changing, different, diverse,” → vary.

Etymology (PE): Vartin, from vart “change,” present stem of vartidan, → vary, + adj. suffix -in.