noun

• Any far-left political ideology or philosophy advocating holding the production of resources collectively, especially by seizing it through revolution.
• Any political social system that implements a communist political philosophy.
• The international socialist society where classes, money, and the state no longer exist.
• 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.