invariable
adj.
early 15c., from Old French invariable (14c.) and directly from Medieval Latin invariabilis, from in- "not, opposite of" (see in-(1)) + variabilis (see variable). Related: Invariably.
〔李〕[in-;vari;-ablea.] a.不变的，恒定的； 一律的 ←vari (L varius)=manifold 多样的
〔蒋〕[in-不，vari=change] 不变的，恒定的