Etymology
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validation (n.)

"act of giving validity," 1650s, noun of action from validate.

updated on March 07, 2014

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Definitions of validation from WordNet

validation (n.)
the act of validating; finding or testing the truth of something;
Synonyms: proof / substantiation
validation (n.)
the cognitive process of establishing a valid proof;
Synonyms: establishment
From wordnet.princeton.edu, not affiliated with etymonline.