predestinarian UK /pɹiːˌdɛs.tɪˈnɛəɹi.ən/US /pɹiˌdɛs.tɪˈnɛɹi.ən/adjective 1noun 1forms 1 adjective1 •Of or relating to predestination.But it is wrong to stress only the predestinarian aspect of protestantism […]. — 1972 noun1 •One who believes in predestination. formspredestinarians