Entry 1 sense Webster, 1913 Retrusion · Re·tru·sion · IPA /ɹɪˈtɹuːʒən/ 01 n. The act of retruding, or the state of being retruded. 1. The act of retruding, or the state of being retruded. “In virtue of an endless remotion or retrusion of the constituent cause.” — Coleridge.