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invariable (adj.)

"constant, uniform, unchanging," early 15c., from Old French invariable (14c.) and directly from Medieval Latin invariabilis, from in- "not, opposite of" (see in- (1)) + variabilis "changeable" (see variable). Related: Invariably.

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Definitions of invariable
1
invariable (n.)
a quantity that does not vary;
Synonyms: constant / constant quantity
2
invariable (adj.)
not liable to or capable of change;
an invariable temperature
his invariable courtesy
an invariable rule
From wordnet.princeton.edu