Dictionary religion |riˈlijən| noun the belief in and worship of a superhuman controlling power, esp. a personal God or gods : ideas about the relationship between science and religion. • details of belief as taught or discussed : when the school first opened they taught only religion, Italian, and mathematics. • a particular system of faith and worship : the world's great religions. • a pursuit or interest to which someone ascribes supreme importance : consumerism is the new religion.