Definition of momentum noun from the Oxford Advanced American Dictionary

     

    momentum

     noun
    noun
    NAmE//moʊˈmɛntəm//
     
    , NAmE//məˈmɛntəm//
     
    [uncountable]
     
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  1. 1the ability to keep increasing or developing The fight for his release gathers momentum each day. They began to lose momentum in the second half of the game.
  2. 2a force that is gained by movement The vehicle gained momentum as the road dipped.
  3. 3(technology) the quantity of movement of a moving object, measured as its mass multiplied by its speed
See the Oxford Advanced Learner's Dictionary entry: momentum