say it: in-VER-ee-uhns
invariance is a noun meaning "the quality of being resistant to variation". It carries 2 recorded senses.
the quality of being resistant to variation
the nature of a quantity or property or function that remains unchanged when a given transformation is applied to it
“the invariance of the configuration under translation”
mathematics
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for invariance come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.