immutability

1. 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:

   • unalterability - the quality of not being alterable
   • agelessness - the quality of being timeless and eternal
   same as: fixity, immutableness

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