Entry 1 sense Webster, 1913 Pantheistic /pănˌ-thē-ĭs'-tĭk/ · Pan·the·is·tic · IPA /pænˈθiɪstɪk/ 01 a. Of or pertaining to pantheism; founded in, or leading to, pantheism. 1. Of or pertaining to pantheism; founded in, or leading to, pantheism.