Entry 1 sense Webster, 1913 Theological /thēˌ-əl-äj'-ĭk-əl/ · The·o·log·ic·al · IPA /θi.əˈlɑd͡ʒɪkl/ 01 a. Of or pertaining to theology, or the science of God and of divine things; as, a theological treatise. 1. Of or pertaining to theology, or the science of God and of divine things; as, a theological treatise.