As a Noun: 1. The political belief that the state should control the means of producing everything, and that there should be no private property. English = communism. 2. A person who believes in communism. English = communist. 3. A person who believes that there should be great changes in society and tries to bring about these changes. English = radical. 4. Someone who is very active in trying to bring about extreme political and social change. English = militant. As a Verb or Adjective: 1. To relate to or be based on communism. English = (be) communist.