Entry 2 senses · 2 variants Webster, 1913 Neo-Kantian · Ne·o-Kant·i·an · IPA a. n. 01 a. Of or pertaining to Neo-Kantianism. 1. Of or pertaining to Neo-Kantianism. 02 n. An adherent of Neo-Kantianism. 1. An adherent of Neo-Kantianism.