deliberately false information leaked by a government, as to confuse another nation's intelligence operations
See disinformation in American Heritage Dictionary 4
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).
Dissemination of such misleading information.
Origin: Possibly translation of Russian dezinformatsiya