Entry 1 sense Webster, 1913 Immaculate /ĭmˌ-ăk'-yo͞ol-ĭt/ · Im·mac·u·late · IPA /ɪˈmækjələt/ 01 a. Without stain or blemish; spotless; undefiled; clear; pure. 1. Without stain or blemish; spotless; undefiled; clear; pure. “Were but my soul as pure From other guilt as that, Heaven did not hold One more immaculate.” — Denham. “Thou sheer, immaculate and silver fountain.” — Shak. Phrases & compounds Immaculate conception — the doctrine that the Virgin Mary was conceived without original sin.