Entry 2 senses · 2 variants Webster, 1913 Wis /wĭs/ · IPA /waɪs/ adv. v. t. 01 adv. Certainly; really; indeed. 1. Certainly; really; indeed.[Obs.] 02 v. t. To think; to suppose; to imagine; -- used chiefly in the first person sing. present tense, I wis. See the Note under Ywis. 1. To think; to suppose; to imagine; -- used chiefly in the first person sing. present tense, I wis. See the Note under Ywis.[Obs. or Poetic] See: Ywis “Nor do I know how long it is (For I have lain entranced, I wis).” — Coleridge.