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English definition of “momentum”

momentum

noun [U]     /məˈmen.təm/ US  /-t̬əm/
C2 the force that keeps an object moving or keeps an event developing after it has started : Once you push it, it keeps going under its own momentum. The spacecraft will fly round the Earth to gain / gather momentum for its trip to Jupiter . The play loses momentum (= becomes less interesting , energetic , etc.) by its half way stage . In an attempt to give new momentum to their plans , the committee set a date for starting detailed discussions .Particular theories and concepts in physicsSpeed of motion
(Definition of momentum noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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