ratify/ˈɹætɪfaɪ/EtymologyFrom Old French ratifier, from Medieval Latin ratifico, from Latin ratus (“reckoned”).ratify means to give formal consent to; make officially valid, sign off on. Lexicurio rates it Rare gem — a strength score of 78 out of 100.verbTo give formal consent to; make officially valid, sign off on.“They ratified the treaty.”