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invariable (adj.)
[invariable 词源字典]
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
.
[invariable etymology, invariable origin, 英语词源]