Momentous
Pronunciation : Mo*men"tous
Part of Speech : a.
Etymology : [Cf. L. momentosus rapid, momentary.]
Definition : Defn: Of moment or consequence; very important; weighty; as, a momentous decision; momentous affairs. -- Mo*men"tous*ly, adv. -- Mo*men"tous*ness, n.
Source : Webster's Unabridged Dictionary, 1913