a. [ Cf. L. momentosus rapid, momentary. ] Of moment or consequence; very important; weighty; as, a momentous decision; momentous affairs. -- Mo*men"tous*ly, adv. -- Mo*men"tous*ness, n. [ 1913 Webster ]
[おもいきる, omoikiru] (v5r, vt) (1) to give up all thoughts of; to abandon; to despair of; (v5r, vi) (2) to make up one's mind; to take a momentous decision; (P)