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

The actress was visibly moved by the momentous win, using her speech to inspire others. Maureen Lee Lenker,, "The best moments of the 2019 Tony Awards," 10 June 2019 So her deciding to share this momentous occasion (and a personal love story) with her followers is definitely no small thing. Sara Delgado, Teen Vogue, "Camila Mendes Supported Boyfriend Charles Melton’s New Movie "The Sun Is Also a Star" and Revealed Why She Fell in Love With Him," 14 May 2019 Of course, with such a momentous occasion to plan ahead for, Kate had the perfect outfit waiting quietly in her wardrobe, and definitely did not disappoint on the fashion front. Lucy Wood, Marie Claire, "Kate Middleton and Meghan Markle's First Solo Appearances with the Queen, Compared," 19 Mar. 2019 Nevertheless, a decision by its junior coalition partner to oppose nuclear sharing would be momentous, putting into question an institution that is as old as Germany’s 1955 membership of the North Atlantic Treaty Organization. Bojan Pancevski, WSJ, "In Germany, a Cold War Deal to Host U.S. Nuclear Weapons Is Now in Question," 12 Feb. 2019 Yet the summer of 2018 could still be momentous for Pulisic. Grant Wahl,, "Masters of Modern Soccer: Christian Pulisic and the Craft of the Attacking Midfielder," 1 May 2018 This song really puts into perspective how momentous this time really is. Kristin Harris, Seventeen, "25 Tear-Inducing Graduation Songs That Perfectly Sum Up All the Feels," 30 Mar. 2018 Laguna Presbyterian celebrated its 100th anniversary in 2017, a doubly momentous year because the church was able to pay off its mortgage, Tankersley said. Bradley Zint,, "Pastor Jerry Tankersley will retire after 46 years at Laguna Presbyterian Church," 19 June 2018 Such a momentous year would have sparked a flurry of anniversary books, articles, and TV specials under any circumstance. Will Bunch,, "How the chaos of 1968 set the stage for a President Donald Trump | Will Bunch," 24 May 2018

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

13 Jun 2019

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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 move with exaggerated bouncy motions

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