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.

Source : WordNet®

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