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English definition of “momentum”

momentum

noun [U] uk   /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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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