Source : Webster's Revised Unabridged Dictionary (1913)

Substantiation \Sub*stan`ti*a"tion\, n.
   The act of substantiating or proving; evidence; proof.

Source : WordNet®

substantiation
     n 1: additional proof that something that was believed (some fact
          or hypothesis or theory) is correct; "fossils provided
          further confirmation of the evolutionary theory" [syn: {confirmation},
           {verification}, {check}]
     2: the act of validating; finding or testing the truth of
        something [syn: {validation}, {proof}]