Pronunciation: (kom'yu-niz"um),[key] —n. 1. a theory or system of social organization based on the holding of all property in common, actual ownership being ascribed to the community as a whole or to the state.
2. (often cap.) a system of social organization in which all economic and social activity is controlled by a totalitarian state dominated by a single and self-perpetuating political party.
3. (cap.) the principles and practices of the Communist party.