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informer

[in-fawr-mer] /ɪnˈfɔr mər/
noun
1.
a person who informs against another, especially for money or other reward.
2.
a person who informs or communicates information or news; informant.
Origin
1350-1400
1350-1400; Middle English; see inform1, -er1
Can be confused
informant, informer.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in-former

informer

/ɪnˈfɔːmə/
noun
1.
a person who informs against someone, esp a criminal
2.
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 in-former

informer

n.

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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