warrant

Synonyms: accreditation assurance authentication authority basis carte blanche certificate commission credential credentials ducat earnest foundation go-ahead green light guarantee license official document okay pass passport pawn permission permit pledge right sanction security shingle sticker subpoena summons tag testimonial ticket token verification warranty word

Antonyms: breach break

Synonyms: affirm answer for approve argue assert assure attest avouch back bear out call for certify claim commission contend declare defend delegate demand empower endorse ensure entitle excuse explain give grounds for guaranty insure license maintain necessitate permit pledge privilege promise require sanction secure sponsor stand behind state stipulate swear take an oath undertake underwrite uphold vindicate vouch for vow