What is the definition of communism

A political theory derived from Karl Marx, advocating class war and leading to a society in which all property is publicly owned and each person works and is paid according to their abilities and needs. It can also mean: a way of organizing a society in which the government owns the things that are used to make and transport. 

Source: Google Search 

 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 as a whole or to the state.