Source : Webster's Revised Unabridged Dictionary (1913)

Corroborate \Cor*rob"o*rate\ (k?r-r?b"?-r?t), v. t. [imp. & p.
   p. {Corroborated} (-r?`t?d); p. pr. & vb. n. {Corroborating}
   (-r?`t?ng). ] [L. corroboratus, p. p. of corroborare to
   corroborate; cor- + roborare to strengthen, robur strength.
   See {Robust}.]
   1. To make strong, or to give additional strength to; to
      strengthen. [Obs.]

            As any limb well and duly exercised, grows stronger,
            the nerves of the body are corroborated thereby.
                                                  --I. Watts.

   2. To make more certain; to confirm; to establish.

            The concurrence of all corroborates the same truth.
                                                  --I. Taylor.

Source : WordNet®

corroborated
     adj : supported or established by evidence or proof; "the
           substantiated charges"; "a verified case" [syn: {substantiated},
            {verified}]