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1. The condition or quality of being unchanging; constancy.
2. The property of being mathematically invariant.
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|Noun||1.||invariance - the quality of being resistant to variation|
unchangeability, unchangeableness, unchangingness, changelessness - the quality of being unchangeable; having a marked tendency to remain unchanged
unvariedness - characterized by an absence of variation
|2.||invariance - 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"|
constancy, stability - the quality of being enduring and free from change or variation; "early mariners relied on the constancy of the trade winds"