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[in-fawr-mer] /ɪnˈfɔr mər/
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 confused
informant, informer. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for informer
Contemporary Examples
Historical Examples
  • 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?

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

    The Republic Plato
British Dictionary definitions for informer


a person who informs against someone, esp a criminal
a person who provides information: he 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
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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
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