unalterability

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WordNet Dictionary
	Definition:		[n]  the quality of being fixed and unchangeable; "the fixedness of his gaze upset her" [n]  the quality of not being alterable
	Synonyms:		fixedness
	Antonyms:		alterability
	See Also:		changelessness, fixity, immutability, immutableness, incurability, unchangeability, unchangeableness, unchangingness