Source : Webster's Revised Unabridged Dictionary (1913)

Verifiable \Ver"i*fi`a*ble\, a.
   Capable of being verified; confirmable. --Bp. Hall.

Source : WordNet®

verifiable
     adj 1: capable of being verified; "a verifiable account of the
            incident"
     2: capable of being tested (verified or falsified) by
        experiment or observation [syn: {confirmable}, {falsifiable}]