invariability

in·var·i·a·ble

 (ĭn-vâr′ē-ə-bəl)

adj.

Not changing or subject to change; constant.

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in·var′i·a·bil′i·ty, in·var′i·a·ble·ness n.

in·var′i·a·bly adv.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Thesaurus

Noun	1.	invariability - a quality of uniformity and lack of variation evenness regularity - the quality of being characterized by a fixed principle or rate; "he was famous for the regularity of his habits" smoothness - the quality of having a level and even surface; "the water was a glassy smoothness"; "the weather system of the Pacific is determined by the uninterrupted smoothness of the ocean" unevenness, variability - the quality of being uneven and lacking uniformity
	2.	invariability - the quality of being resistant to variation invariableness, invariance unchangeability, unchangeableness, unchangingness, changelessness - the quality of being unchangeable; having a marked tendency to remain unchanged unvariedness - characterized by an absence of variation variability, variableness, variance - the quality of being subject to variation

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