IMMUTABILITY
immutability, immutableness, fixity
(noun) the quality of being incapable of mutation; “Darwin challenged the fixity of species”
Source: WordNet® 3.1
Etymology
Noun
immutability (usually uncountable, plural immutabilities)
The state or quality of being immutable; immutableness.
(computer) The state of being unchangeable in the memory after creation.
Source: Wiktionary
Im*mu`ta*bil"i*ty, n. Etym: [L. immutabilitas: cf. F. immutabilité.]
Definition: The state or quality of being immutable; immutableness. Heb.
vi. 17.
Source: Webster’s Unabridged Dictionary 1913 Edition