Entry 2 senses · 2 variants Webster, 1913 Predestinarian · Pre·des·ti·na·ri·an · IPA /pɹiˌdɛs.tɪˈnɛɹi.ən/ a. n. 01 a. Of or pertaining to predestination; as, the predestinarian controversy. 1. Of or pertaining to predestination; as, the predestinarian controversy. 02 n. One who believes in or supports the doctrine of predestination. 1. One who believes in or supports the doctrine of predestination.