Definition: substantiate

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Source: WordNet (r) 1.7 

substantiate
     v 1: establish or strengthen as with new evidence or facts; "his
          story confirmed my doubts"; "The evidence supports the
          defendant" [syn: confirm, corroborate, sustain, support,
           affirm] [ant: negate]
     2:  establish as valid or genuine; "Can you substantiate your
        claims?" [syn: back, back up]

Source: Webster's Revised Unabridged Dictionary (1913) 

Substantiate \Sub*stan"ti*ate\, v. t. [imp. & p. p.
   Substantiated; p. pr. & vb. n. Substantiating.]
   1. To make to exist; to make real. --Ayliffe.

   2. To establish the existence or truth of by proof or
      competent evidence; to verify; as, to substantiate a
      charge or allegation; to substantiate a declaration.

            Observation is, in turn, wanted to direct and
            substantiate the course of experiment. --Coleridge.