rat·i·fy 
(rătə-fī′)
(rătə-fī′)tr.v. rat·i·fied, rat·i·fy·ing, rat·i·fies
To approve and give formal sanction to; confirm: The Senate ratified the treaty.
[Middle English ratifien, from Old French ratifier, from Medieval Latin ratificāre : Latin ratus, fixed, past participle of rērī, to reckon, consider; see RATE1 + Latin -ficāre, -fy.]
rat′i·fi·cation (-fĭ-kāshən) n.
rati·fi′er n.