Meaning of MOMENTUM in English

MOMENTUM

[noun] [U] - the force that keeps an object moving or an event developing after a start has been madeOnce you push it, it keeps going under its own momentum.The spacecraft will fly round the Earth to gain momentum for its trip to Jupiter.The play loses momentum by its half-way stage.Several attempts to arrange a protest march failed to gather momentum.The firm has been growing rapidly, but you can't keep that kind of momentum up forever.In an attempt to give new momentum to their plans, the committee set a date for starting detailed discussions.The gathering momentum towards central control of the economy is worrying.

Cambridge English vocab.      Кембриджский английский словарь.