Propaganda is defined as the systematic, widespread distribution of specific ideas, doctrines, practices which can help one cause or be harmful to another cause.
See propaganda in Webster's New World College Dictionary
Origin: ModL, short for congregatio de propaganda fide, congregation for propagating the faith: see propagate
See propaganda in American Heritage Dictionary 4
Origin: Short for New Latin Sacra Congregātiō dē Prōpagandā Fidē, Sacred Congregation for Propagating the Faith (established 1622)
Origin: , from ablative feminine gerundive of Latin prōpāgāre, to propagate; see propagate.
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