Where does “nonequivalence” come from?
nonequivalence (English) comes from English equivalence, from French équivalence, from Latin aequivalentia, from Latin aequivalēns, from Latin aequivaleō, from Latin valeō, from Proto-Italic walēō, from Proto-Indo-European h₂wl̥h₁éh₁yeti — to rule; strong, powerful; hair; wool.
nonequivalence (English): inequivalence
Ancestry of “nonequivalence”, step by step