The American Heritage® Dictionary of the English Language, 4th Edition
n. 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).
n. The dissemination of intentionally false information to deliberately confuse or mislead.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. misinformation that is deliberately disseminated in order to influence or confuse rivals (foreign enemies or business competitors etc.)
Word Usage
"GENEVA — The U. N.'s top human rights official hailed the global body's second racism conference as a success Friday, despite what she called a disinformation campaign that almost derailed the meeting."