Synonyms and related words :
John Hancock, OK, acceptance, affidavit, affirmance, affirmation, approbation, approval, ascertainment, assurance, attestation, authentication, authority, authorization, backing, backing up, bearing out, bill of health, bolstering, buttressing, certificate, certificate of proficiency, check, checking, circumstantiation, clearance, collation, confirmation, corroboration, corroboratory evidence, countenance, countersignature, credential, deposition, determination, diploma, documentation, empowerment, enabling, endorsement, enfranchisement, ensuring, entitlement, establishment, fiat, fortification, go-ahead, green light, imprimatur, navicert, nod, notarization, notarized statement, note, okay, permission, proof, proving, proving out, ratification, reassurance, reassurement, reinforcement, rubber stamp, sanction, seal, sheepskin, sigil, signature, signet, stamp, stamp of approval, statement under oath, strengthening, subscription, substantiation, support, supporting evidence, swearing, sworn statement, sworn testimony, testamur, testimonial, testimony, the nod, ticket, undergirding, validation, verification, visa, vise, voucher, vouching, warrant, warranty, witness