Liberal Dictionary English Dictionary
noun
- a person who informs against another, especially for money or other reward.
- a person who informs or communicates information or news; informant.
noun
- a person who informs against someone, esp a criminal
- a person who provides informationhe was the President’s financial 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.