Definition of momentousness in English:

momentousness

noun

  • See momentous

    • ‘The guys were strangely subdued, given the momentousness of the occasion.’
    • ‘His later output as a painter does not compare in momentousness with his pre-war work, but it remained prodigious in terms of sheer quantity.’
    • ‘It is impossible to overstate the momentousness of such events, and yet they have fallen into a shadowy disregard, eclipsed by recent history.’
    • ‘He didn't seem to care what he published - the act of publication was no longer invested for him with any momentousness.’
    • ‘‘Yes,’ said the delicate boy, fingers touching his lips as the momentousness of his confession struck home.’

Pronunciation

momentousness

/mə(ʊ)ˈmɛntəsnəs/