Source : Webster's Revised Unabridged Dictionary (1913)

Propaganda \Prop`a*gan"da\, n. [Abbrev. fr. L. de propaganda
   fide: cf. F. propagande. See {Propagate}.]
   1. (R. C. Ch.)
      (a) A congregation of cardinals, established in 1622,
          charged with the management of missions.
      (b) The college of the Propaganda, instituted by Urban
          VIII. (1623-1644) to educate priests for missions in
          all parts of the world.

   2. Hence, any organization or plan for spreading a particular
      doctrine or a system of principles.

Source : WordNet®

propaganda
     n : information that is spread for the purpose of promoting some
         cause