The aim of this essay is to provide a theoretically satisfactory denition of communitarianism, a denition which would be theoretically prolic and so fully substantial that it would allow to distinguish communitarianism from the other philosophical streams; and it would give us an answer as to why a given idea or thinker is categorized as communitarian. e essence of this goal is to show a rationally justied method of constructing the denition of communitarianism is aim will be achieved in three steps: 1. Showing that communitarianism related research has not been able to provide a theoretically satisfactory denition of the philosophy; 2. Identifying the causes of this theoretical failure; 3. Formulating a rational method for constructing the theoretically satisfactory denition of communitarianism.