substantiate \substan"tiate\, v. t. imp.  p. p.
   substantiated; p. pr.  vb. n. substantiating.
   1. to make to exist; to make real. --ayliffe.
      1913 webster

   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.
      1913 webster

            observation is, in turn, wanted to direct and
            substantiate the course of experiment. --coleridge.
      1913 webster
see also:
substantiated substantiating 

substantiating
     adj : serving to support or corroborate; "collateral evidence"
           syn: collateral, confirmative, confirming, confirmatory,
            corroborative, corroboratory, substantiative, validating,
            validatory, verificatory, verifying
see also:
collateral confirmative confirming confirmatory corroborative corroboratory 
substantiative validating validatory verificatory verifying