Source : Webster's Revised Unabridged Dictionary (1913)

Corroborate \Cor*rob"o*rate\ (-r?t), a.
   Corroborated. [Obs.] --Bacon.

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®

corroborate
     v 1: establish or strengthen as with new evidence or facts; "his
          story confirmed my doubts"; "The evidence supports the
          defendant" [syn: {confirm}, {sustain}, {substantiate}, {support},
           {affirm}] [ant: {negate}]
     2: give evidence for [syn: {validate}]
     3: support with evidence or authority or make more certain or
        confirm; "The stories and claims were born out by the
        evidence" [syn: {underpin}, {bear out}, {support}]