Entry 1 sense Webster, 1913 Nothingarian · Noth·ing·a·ri·an · IPA /ˌnʌθɪŋˈ(ɡ)ɛ.ɹi.ən/ 01 n. One of no certain belief; one belonging to no particular sect. 1. One of no certain belief; one belonging to no particular sect.