Communism /kɒ.mjə.nɪ.zəm/ noun3 •The ideology of political parties that use the term Communist in their names, usually Marxist and Leninist. •The socio-economic system based on such parties' ideologies. •(US, informal) A state of affairs perceived as oppressive, overly arbitrary, or totalitarian.. ..he shouldn't...just...[say]..."I -- I am responsible for prosperity,"...that's Communism, Sir, you see. — 1953