Definition of momentum
- The wagon gained momentum as it rolled down the hill.
The company has had a successful year and hopes to maintain its momentum by introducing new products.
The movie loses momentum toward the end.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'momentum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use: 1610See Words from the same year
: the strength or force that something has when it is moving
: the strength or force that allows something to continue or to grow stronger or faster as time passes
physics : the property that a moving object has due to its mass and its motion
What made you want to look up momentum? Please tell us where you read or heard it (including the quote, if possible).
Merriam-Webster's New Words Quiz—Fall 2017 Edition!
Test your vocabulary with our 10-question quiz!TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.TAKE THE QUIZ