Imprimatur

(n.) A license to print or publish a book, paper, etc.; also, in countries subjected to the censorship of the press, approval of that which is published.

Thesaurus Entries

John Hancock, OK, acceptance, affirmance, affirmation, approbation, approval, authentication, authorization, building permit, certification, confirmation, countersignature, endorsement, fishing license, go-ahead, green light, hunting license, license, nihil obstat, nod, notarization, okay, permission, permit, ratification, rubber stamp, sanction, seal, sigil, signature, signet, stamp, stamp of approval, subscription, the nod, validation, visa, vise, warrant