ratifyEnglishOxford English Thesaurusratify verb both countries were due to ratify the treaty by the end of the year: confirm, approve, sanction, endorse, agree to, accept, consent to, assent to, affirm, uphold, corroborate, authorize, formalize, certify, validate, recognize; sign, countersign, put one's name to. ▷antonyms reject, revoke.ratify Oxford Dictionary of English