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 Senate’s historic impeachment trial of President Donald Trump will be especially momentous for a small group of vulnerable incumbent senators whose 2020 re-election bids are central to determining control of the chamber. Laura Litvan, Fortune, "Trump Impeachment Trial Will Test Vulnerable Incumbent Senators," 30 Dec. 2019 Today the district is a battleground in a national election whose result could be nearly as momentous. The Economist, "If the Peronists win in Argentina, which Fernández will be in charge?," 17 Oct. 2019 Even a tentative agreement would be momentous for the U.S. and would mark the ending of the country’s longest war, which has stretched on for nearly two decades. Barnini Chakraborty, Fox News, "Taliban says agreement on U.S. troop withdrawal in Afghanistan is close," 29 Aug. 2019 The momentous meeting occurred in the prosaic setting of a hotel lobby in Hampton. USA Today, "Pam’s family enslaved black people. Wanda believes her ancestor was one of them. They met, and are confronting a painful history," 17 Dec. 2019 Friday was probably the most momentous day in trade history ever. CBS News, "Transcript: Robert Lighthizer on "Face the Nation," December 15, 2019," 15 Dec. 2019 The memory of the guide stayed with Twain, long after other details of his momentous trip had faded. Karen Chernick, Smithsonian, "The Museum Tour Guide Who Shaped Mark Twain’s Views on Race," 26 Nov. 2019 The public impeachment inquiry hearings this week usher in a rare and momentous occasion in American history as Congress debates whether to remove a president from office. Eric Tucker, Fortune, "How Trump’s Public Impeachment Hearings Will Differ From Clinton’s and Nixon’s," 12 Nov. 2019 The momentous judgment comes merely weeks before the 27th anniversary of the demolition of the Babri Masjid on Dec. 6, 1992. Niharika Sharma, Quartz India, "India’s top court paves the way for a temple to be built at the disputed site in Ayodhya," 9 Nov. 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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Time Traveler for momentous

Time Traveler

The first known use of momentous was in 1656

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Statistics for momentous

Last Updated

10 Jan 2020

Cite this Entry

“Momentous.” The Dictionary, Merriam-Webster Inc., Accessed 20 January 2020.

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More Definitions for momentous


How to pronounce momentous (audio)

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).


not to be intimidated or subdued

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