noun
the quality of being incapable of mutation
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Darwin challenged the fixity of species
• Syn: ↑immutableness, ↑fixity
• Ant: ↑mutableness (for: ↑immutableness), ↑mutability
• Derivationally related forms: ↑immutable (for: ↑immutableness), ↑immutable
• Hypernyms: ↑changelessness, ↑unchangeability, ↑unchangeableness, ↑unchangingness
• Hyponyms: ↑unalterability, ↑agelessness
Useful english dictionary. 2012.