Entry 1 sense Webster, 1913 Topmost · Top·most · IPA /tɑpˈmoʊst/ 01 a. Highest; uppermost; as, the topmost cliff; the topmost branch of a tree. 1. Highest; uppermost; as, the topmost cliff; the topmost branch of a tree. “The nightngale may claim the topmost bough.” — Cowper.