Etymology
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validity (n.)

1540s, from French validité or directly from Late Latin validitatem (nominative validitas) "strength," from Latin validus (see valid).

updated on December 07, 2020

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Definitions of validity from WordNet

validity (n.)
the quality of being valid and rigorous;
Synonyms: cogency / rigor / rigour
validity (n.)
the quality of having legal force or effectiveness;
Synonyms: validness
From wordnet.princeton.edu, not affiliated with etymonline.