Entry 2 senses · 2 variants Webster, 1913 disputant · dis·pu·tant · IPA /dɪˈspjuː.tənt/ a. n. 01 a. Disputing; engaged in controversy. 1. Disputing; engaged in controversy. 02 n. One who disputes; one who argues in opposition to another; one appointed to dispute; a controvertist; a reasoner in opposition. 1. One who disputes; one who argues in opposition to another; one appointed to dispute; a controvertist; a reasoner in opposition. “A singularly eager, acute, and pertinacious disputant.” — Macaulay.