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  1. of great or far-reaching importance or consequence: a momentous day.
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Origin of momentous

First recorded in 1645–55; moment + -ous
Related formsmo·men·tous·ly, adverbmo·men·tous·ness, nounun·mo·men·tous, adjectiveun·mo·men·tous·ly, adverbun·mo·men·tous·ness, noun

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for momentous


  1. of great significance
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Derived Formsmomentously, adverbmomentousness, 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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper