mo·​men·​tous | \ mō-ˈmen-təs How to pronounce momentous (audio) , mə-\

Definition of momentous

: important, consequential a momentous decision a momentous event

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Other Words from momentous

momentously adverb
momentousness noun

Examples of momentous in a Sentence

My college graduation was a momentous day in my life. a momentous occasion that will go down in the history books

Recent Examples on the Web

Far to the north, a nonjudicial execution spurred a still more momentous result. Andrew Cockburn, Harper's magazine, "Power of Attorney," 16 Sep. 2019 That, folks, was a momentous victory for the Buffaloes. Jon Wilner, The Denver Post, "Pac-12 football Week 2 recap: USC rolls, UCLA rolls over, Colorado’s comeback, Cal’s upset and more," 8 Sep. 2019 The federation was also instrumental in helping to facilitate the NWSL’s momentous sponsorship deal with Budweiser coming out of the World Cup this summer. Jamie Goldberg, oregonlive, "National Women’s Soccer League enters new era with U.S. Soccer’s role in league set to change," 3 Sep. 2019 Rather than stumbling into the center of one momentous event after another, Levandowski has put himself there. Wired, "How Anthony Levandowski Put Himself at the Center of an Industry," 29 Aug. 2019 The network is celebrating the 36th go-round of the momentous event — which has seen some incredible fashion through the years. Teen Vogue, "The Most Controversial VMAs Red Carpet Looks," 23 Aug. 2019 On the surface, the novelist who was a newborn when the momentous events of that summer unfolded has a hopeless task: The center of the book-buying public has vivid memories of the time. David Shribman,, "Tuned in to the ‘Summer of ’69’," 22 Aug. 2019 Share with your kids what a momentous event that was by checking out the special planetarium show at the Milwaukee Public Museum. Amy Schwabe, Milwaukee Journal Sentinel, "Planning a staycation around the 4th of July? Here are some things to do with your kids.," 1 July 2019 Only that night Hope threw out the script because of the momentous events taking place 5,000 miles away — and nine hours ahead — on the beaches of Normandy, France. Erik Lacitis, The Seattle Times, "75 years ago, an anxious Seattle turned to radio, newspapers to learn about the D-Day invasion," 2 June 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'momentous.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of momentous

1656, in the meaning defined above

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Statistics for momentous

Last Updated

19 Sep 2019

Look-up Popularity

Time Traveler for momentous

The first known use of momentous was in 1656

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More Definitions for momentous



English Language Learners Definition of momentous

: very important : having great or lasting importance


mo·​men·​tous | \ mō-ˈmen-təs How to pronounce momentous (audio) \

Kids Definition of momentous

: very important a momentous decision

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Comments on momentous

What made you want to look up momentous? Please tell us where you read or heard it (including the quote, if possible).


to spread over or through

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