momentum

noun

mo·​men·​tum mō-ˈmen-təm How to pronounce momentum (audio)
mə-
plural momenta mō-ˈmen-tə How to pronounce momentum (audio)
mə-
or momentums
1
: a property (see property sense 1a) of a moving body that the body has by virtue of its mass (see mass entry 2 sense 1c) and motion and that is equal to the product of the body's mass and velocity
broadly : a property of a moving body that determines the length of time required to bring it to rest when under the action of a constant force or moment
2
: strength or force gained by motion or by a series of events
The wagon gained momentum as it rolled down the hill.

Examples of momentum in a Sentence

The company has had a successful year and hopes to maintain its momentum by introducing new products. The movie loses momentum toward the end.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Ajay Mitchell Should Play Key Role Although his rookie season lost some momentum due to an injury that kept him out down the stretch of the regular season, Mitchell was undoubtedly one of the best rookies in last year’s class. Nick Crain, Forbes.com, 20 July 2025 Roberts left the door open for Betts to sit Sunday, too, as the Dodgers hope their superstar can generate some positive offensive momentum. Fabian Ardaya, New York Times, 20 July 2025 The phenomenon of Trump has now re-oriented thinking in Europe and Asia, shifted the momentum of the Russia-Ukraine war, shaken for the first time in decades the foundations of open global trade and put into question the dollar as the global reserve currency. New York Daily News Editorial Board, New York Daily News, 20 July 2025 Such an abrupt halt to the WNBA's momentum could prove difficult to bounce back from. Becky Sullivan, NPR, 19 July 2025 See All Example Sentences for momentum

Word History

Etymology

New Latin, from Latin, movement

First Known Use

1610, in the meaning defined at sense 1

Time Traveler
The first known use of momentum was in 1610

Browse Nearby Words

Cite this Entry

“Momentum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/momentum. Accessed 25 Jul. 2025.

Kids Definition

momentum

noun
mo·​men·​tum mō-ˈment-əm How to pronounce momentum (audio)
plural momenta -ˈment-ə How to pronounce momentum (audio) or momentums
1
: the characteristic of a moving body that is caused by its mass and its motion
2

Medical Definition

momentum

noun
mo·​men·​tum mō-ˈment-əm, mə-ˈment- How to pronounce momentum (audio)
plural momenta -ˈment-ə How to pronounce momentum (audio) or momentums
: a property of a moving body that the body has by virtue of its mass and motion and that is equal to the product of the body's mass and velocity
broadly : a property of a moving body that determines the length of time required to bring it to rest when under the action of a constant force

More from Merriam-Webster on momentum

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