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Not changing or subject to change; constant.
in·var′i·a·bil′i·ty, in·var′i·a·ble·ness n.
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|Noun||1.||invariableness - 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