'Momentousness' definitions:

Definition of 'momentousness'

From: WordNet
noun
Utmost importance

Definition of 'Momentousness'

From: GCIDE
  • Momentous \Mo*men"tous\, 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]

Definition of 'momentousness'

From: GCIDE
  • momentousness \mo*men"tous*ness\ n. utmost importance. [WordNet 1.5]