fixity

Noun
  1. The quality of being fixed in place as by some firm attachment (synset 104784337)
    is a type of: immovability, immovableness - not capable of being moved or rearranged
    subtypes: lodgement, lodging, lodgment - the state or quality of being lodged or fixed even temporarily
    same as: fastness, fixedness, fixture, secureness
  2. The quality of being incapable of mutation (synset 104749047)
    "Darwin challenged the fixity of species"
    is a type of: changelessness, unchangeability, unchangeableness, unchangingness - the quality of being unchangeable; having a marked tendency to remain unchanged
    subtypes:
    same as: immutability, immutableness

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