imprimatur (n.) Look up imprimatur at
"license to print, granted by a licenser of the press," 1640, Modern Latin, literally "let it be printed," the formula of a book licenser, third person singular present subjunctive passive of Latin imprimere "to print, engrave, stamp; press upon, press against" (see impress (v.1)). Originally of state license to print books, later only of Roman Catholic Church.