utilitarianist /jʊtɪlɪˈtɛːɹiənɪst/adjective 1noun 1forms 3 adjective1 •Relating to utilitarianism. noun1 •One who subscribes to the philosophy of utilitarianism.In contrast to the egoist, the utilitarianist defines acceptable behavior as that which maximizes the principle of utility — the greatest good for the greatest number of people. — 2001 formsutilitarianists · more utilitarianist · most utilitarianist