adj. 1 pure, spotless; perfectly clean. 2 perfectly or extremely well executed (an immaculate performance). 3 free from fault; innocent. 4 Biol. not spotted. Immaculate Conception RC Ch. the doctrine that God preserved the Virgin Mary from the taint of original sin from the moment she was conceived. immaculacy n. immaculately adv. immaculateness n.
[ ME f. L immaculatus (as IN-(1), maculatus f. macula spot) ]