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[moh-men-tuh s] /moʊˈmɛn təs/
of great or far-reaching importance or consequence:
a momentous day.
Origin of momentous
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. 2015.
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Examples from the web for momentous
  • These thoughts concern themselves only with things that seem important and of momentous interest to us.
  • The momentous event would clear away the trivia and throw my life into proper perspective.
  • The end of the fiscal year usually isn't a momentous occasion for colleges.
  • So it is a momentous thing to contemplate the return of inflation, however mild, by the year's end.
  • The fascinating story of a single momentous day in our country's history.
  • Few things stand out in modern human history that are as momentous.
  • But in more momentous ways, the president was facing serious disadvantages, some of his own making.
  • Things that ought to be easy and even pleasurable turn into momentous tasks.
  • One such period of momentous change is now facing the world's airline industry.
  • Illuminates a momentous time of technical advancement.
British Dictionary definitions for momentous


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 momentous

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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