accumulational

Etymology tree Proto-Indo-European *h₂éd Proto-Italic *ad Proto-Italic *ad- Latin ad- Proto-Indo-European *ḱewh₁- Proto-Indo-European *ḱuh₁mósder.? Latin cumulus Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Italic *-āō Latin -ō Latin cumulō Latin accumulō Proto-Indo-European *-tisder. Proto-Italic *-tjō Latin -tiō Latin accumulātiōder. Middle French accumulationbor. ▲ Latin accumulātiōbor. Middle English acumulacyon English accumulation Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālisbor. Old French -albor. ▲ Latin -ālis Old French -elbor. ▲ Latin -ālisbor. Middle English -al English -al English accumulational From accumulation + -al.

来源：wiktionary