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[moh-men-tuh s] /moʊˈmɛn təs/
of great or far-reaching importance or consequence:
a momentous day.
Origin of momentous
First recorded in 1645-55; moment + -ous
Related forms
momentously, adverb
momentousness, noun
unmomentous, adjective
unmomentously, adverb
unmomentousness, noun
vital, critical, crucial, serious. See heavy.
trivial, trifling. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for momentousness
Historical Examples
  • He seemed overwhelmed at the momentousness of the act which he was about to perform.

  • Apart from the splendour of her social position and the momentousness of her political one, she was a person of great wealth.

    Queen Victoria Lytton Strachey
  • As I waited the coming of my most powerful customer, I could not keep my mind off the momentousness of the interview before me.

    Frenzied Finance Thomas W. Lawson
  • Yes, she had been blindly selfish, and had failed to realize the momentousness of the great questions of the day.

    The Liberty Girl Rena I. Halsey
  • Only the irrepressible Tubby was not duly impressed with the momentousness of the occasion.

    The Boy Scouts' Mountain Camp

    John Henry Goldfrap
  • Wade felt the momentousness of that query, but it seemed her face had been telltale enough, without confirmation of words.

  • They had gone to sleep bubbling over with the momentousness of the coming day, and now that day had opened.

  • It was now that the momentousness of the question I was about to decide rushed with its genuine force upon my apprehension.

    Edgar Huntley Charles Brockden Brown
  • The very wetness of the air impregnated all it touched with the momentousness of the hour.

British Dictionary definitions for momentousness


of great significance
Derived Forms
momentously, adverb
momentousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for momentousness



1650s, from moment + -ous to carry the sense of "important" while momentary kept the meaning "of an instant of time." Related: Momentously; momentousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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