Source : Webster's Revised Unabridged Dictionary (1913)

Validate \Val"i*date\, v. t. [See {Valid}.]
   To confirm; to render valid; to give legal force to.

         The chamber of deputies . . . refusing to validate at
         once the election of an official candidate. --London
                                                  Spectator.

Source : WordNet®

validate
     v 1: declare or make legally valid [syn: {formalize}, {formalise}]
          [ant: {invalidate}]
     2: prove valid; show or confirm the validity of something [ant:
         {invalidate}]
     3: give evidence for [syn: {corroborate}]
     4: make valid or confirm the validity of; "validate a ticket"
        [ant: {invalidate}]