Entry 2 senses · 2 variants Webster, 1913 Rater /(rāt"ẽr)/ · Rat·er · IPA /ˈɹeɪtə(ɹ)/ n. n. 01 n. One who rates or estimates. 1. One who rates or estimates. 02 n. One who rates or scolds. 1. One who rates or scolds.