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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 momentously
Historical Examples
  • He was momentously deciding between the emperor and Hoshiko.

    The Way of the Gods John Luther Long
  • It is rather the reawakening of an old temper to which England's history has so often and so momentously given expression.

    Vanishing Roads and Other Essays Richard Le Gallienne
  • Cantelupe stands up, so momentously that Horsham's gentle flow of speech dries up.

    Waste Granville Barker
  • He always spoke respectfully of Effie, and as if momentously impressed with a sense of duty towards her.

  • Thus arose the momentously important mediæval institutions of the Common Land, owned side by side with private land.

    A Short History of England

    G. K. Chesterton
  • "They expect you and me to set at the Ordinary's table along with the speakers," he announced, momentously.

    The Cottage of Delight Will N. Harben
British Dictionary definitions for momentously


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 momentously



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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