Entry 2 senses Webster, 1913 Naturalistic /năchˌ-ẽr-əl-ĭs'-tĭk/ · Nat·u·ral·is·tic · IPA /nˌætʃərəlˈɪstɪk/ 01 a. Belonging to the doctrines of naturalism. 1. Belonging to the doctrines of naturalism. 2. Closely resembling nature; realistic.