Etymology
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invariability (n.)

"lack of variability or of liability to change," 1640s, from invariable + -ity. Invariableness is from 1650s.

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Definitions of invariability

invariability (n.)
a quality of uniformity and lack of variation;
Synonyms: evenness
invariability (n.)
the quality of being resistant to variation;
Synonyms: invariableness / invariance
From wordnet.princeton.edu