to make valid; substantiate; confirm

Time validated our suspicions.

to give legal force to; legalize.

to give official sanction, confirmation, or approval to, as elected officials, election procedures, documents, etc.

to validate a passport.

verb

refuse , reject , veto

verb

approve , authenticate , authorize , bear out , certify , confirm , constitute , corroborate , endorse , give stamp of approval , give the go-ahead , give the green light , give the nod , john hancock * , justify , legalize , legitimize , make binding , make legal , make stick , okay * , ratify , rubber-stamp , sanction , set seal on , sign off on , substantiate , verify , attest , back , evidence , testify , warrant , demonstrate , establish , show , prove , sign , vet