Etymology
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fixity (n.)

1660s in physics; general use from 1791; see fix (v.) + -ity.

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Definitions of fixity

fixity (n.)
the quality of being fixed in place as by some firm attachment;
Synonyms: fastness / fixedness / fixture / secureness
fixity (n.)
the quality of being incapable of mutation;
Darwin challenged the fixity of species
Synonyms: immutability / immutableness
From wordnet.princeton.edu