assimilation
n.
early 15c., "act of assimilating," from Old French assimilacion, from Latin assimilationem (nominative assimilatio) "likeness, similarity," noun of action from past participle stem of assimilare (see assimilate). Psychological sense is from 1855.
〔蒋〕[simil，simul相似，相同，-ation名词后缀] 同化(作用)