Etymology
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imprimatur (n.)

"licence 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," from assimilated form of in- "into, in, on, upon" (from PIE root *en "in") + premere "to press, hold fast, cover, crowd, compress" (from PIE root *per- (4) "to strike"). Originally of state licence to print books, later only of Roman Catholic Church.

updated on October 19, 2017

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Definitions of imprimatur from WordNet

imprimatur (n.)
formal and explicit approval;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.