a person who informs against another, especially for money or other reward.
a person who informs or communicates information or news; informant.

Origin of informer

Middle English word dating back to 1350–1400; see origin at inform1, -er1
Can be confusedinformant informer Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for informer

Contemporary Examples of informer

Historical Examples of informer

  • Not for twenty times 20,000 francs would I have them know me as the informer.

    Night and Morning, Complete

    Edward Bulwer-Lytton

  • I hold my pardon, and care not a maravedi for spy or informer.

    Micah Clarke

    Arthur Conan Doyle

  • With mind relieved, he thanked the informer and prepared to leave the station.

    A Nest of Spies

    Pierre Souvestre

  • Indeed, Thrasymachus, and do I really appear to you to argue like an informer?

  • And now cheat and play the informer if you can; I ask no quarter at your hands.

British Dictionary definitions for informer



a person who informs against someone, esp a criminal
a person who provides informationhe was the President's financial informer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for informer

late 14c., enfourmer "instructor, teacher," native agent noun from inform and also from Old French enformeor. Meaning "one who gives information against another" (especially in reference to law-breaking) is c.1500.

Online Etymology Dictionary, © 2010 Douglas Harper