"invariant" in the noun sense
1. invariant
a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it
"invariant" in the adjective sense
1. invariant
unaffected by a designated operation or transformation
2. changeless, constant, invariant, unvarying
unvarying in nature
"maintained a constant temperature"
"principles of unvarying validity"
Source: WordNet® (An amazing lexical database of English)
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