Etymology
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substantiation (n.)

1760, "embodiment;" 1832, "the making good of a statement, the act of proving," noun of action from substantiate.

updated on December 31, 2013

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Definitions of substantiation from WordNet

substantiation (n.)
additional proof that something that was believed (some fact or hypothesis or theory) is correct;
substantiation (n.)
the act of validating; finding or testing the truth of something;
Synonyms: validation / proof
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.