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

Definition of momentous

: having great or lasting importance : consequential, significant a momentous decision a momentous event/occasion The Senate begins a momentous debate on health care today …The New York Times Deydey usually talked about his travels, the places he'd seen and the people, the close calls and momentous encounters with animals, weather, other Anishinabeg, and best of all, ghosts.— Louise Erdrich The late nineteenth century was strewn with inventions. Many were momentous, but few affected men and women more closely than the bicycle and its motorized offspring: motorcycle, motor-car and aeroplane.— Eugen Weber

Other Words from momentous

momentously adverb
a momentously important decision … a … twist that is executed differently from the comic book story, but is just as dramatically and momentously presented. The Philippines Daily Inquirer
momentousness noun
But other East Europeans had little time to marvel at the momentousness of the moment. Just one day after the fall of the [Berlin] Wall, Bulgaria's dour leader of 35 years, Todor Zhivkov, was ousted. — Stephen E. Deane

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 event was such a momentous occasion that former Governor and then-presidential candidate Jimmy Carter presided over the opening. Eric Dusenbery, ajc, 3 Jan. 2022 After the challenges of 2020, the ability to bring both cocktail concepts back safely is a momentous occasion to toast to this year. Rachel King, Fortune, 18 Dec. 2021 His father, Daniel, photographed and videotaped the momentous occasion. Laura Crimaldi,, 13 Nov. 2021 The event was an emotional one as other celebrities, including Ciara, and a crowd of fans gathered to witness the momentous occasion. Michella Oré, Allure, 9 Nov. 2021 In the decades since that ship’s momentous launch, Viareggio has become the world’s hub for building superyachts. Mark Ellwood, Robb Report, 11 Apr. 2021 As Queen Elizabeth reaches the end of a momentous and bittersweet year, her annual Christmas Day message has struck a deeply personal tone. Erin Hill And Lanford Beard,, 25 Dec. 2021 Issa and Nathan separate from the crew and decide to take a (rather momentous) ride on the famous Coachella Ferris wheel. Essence, 23 Dec. 2021 Widely regarded as the greatest player on the planet, Messi flew to Paris on Tuesday to complete the most stunning and momentous transfer in recent memory by joining Paris Saint-Germain as a free agent. Joshua Robinson, WSJ, 10 Aug. 2021

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

1631, in the meaning defined above

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Time Traveler for momentous

Time Traveler

The first known use of momentous was in 1631

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Dictionary Entries Near momentous

moment of truth



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Last Updated

6 Jan 2022

Cite this Entry

“Momentous.” Dictionary, Merriam-Webster, Accessed 17 Jan. 2022.

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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

More from Merriam-Webster on momentous

Nglish: Translation of momentous for Spanish Speakers

Britannica English: Translation of momentous for Arabic Speakers


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