1. Deliberately misleading information announced publicly or leaked by a government or especially by an intelligence agency in order to influence public opinion or the government in another nation: "He would be the unconscious channel for a piece of disinformation aimed at another country's intelligence service" (Ken Follett).
2. Dissemination of such misleading information.

[Possibly translation of Russian dezinformatsiya.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.