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momentum

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momentum/moʊˈmɛntəm/noun
momentum
/moʊˈmɛntəm/
noun
Learner's definition of MOMENTUM  
[noncount]
: the strength or force that something has when it is moving
   b  : 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
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