noun
authorization
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
verb
guarantee, justify, authorize
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