GNU Collaborative International Dictionary of English

Found one definition

1.       
   ‖Imprimatur (?), n. [L., let it be printed.]
   1. (Law) 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.
   
   [1913 Webster]
   
   
   2. (R. C. Ch.) Permission granted from a designated eccliastical authority to publish a book or other document; -- required by church law for Catholics, especially ecclesiastics, who wish to publish.
   
   [PJC]
   
   
   3. Hence: Official approval for some proposed activity; as, “a contract this large needs the imprimatur of the legal department”.
   
   [PJC]