the force or energy with which a body moves
动力,原动力
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hit the booster coil before the flywheel loses all its impetus .在飞轮还没有失去所有动力前打一下启动线圈。
the force that makes something happen or happen more quickly
促进,推动,激励
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the crisis of the 1860s provided the original impetus for the settlements .19世纪60年代的危机给开拓那些移民点提供了最初的推动力。
"mid 17th cent.: from Latin, ‘assault, force', from