Part of speech: noun

The energy with which anything moves or is driven.

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Usage examples "impetus":

  1. Others say that he is carried up by the impetus he has already obtained, by having previously descended from an equal or greater height. - "The Boy Hunters", Captain Mayne Reid.
  2. His popularity, as yet, was mainly due to a general detestation of the rule he had replaced; but such a sentiment gives to a new sovereign an impetus which, if he knows how to use it, will carry him a long way toward success; and among those in the Duke's confidence it was rumoured that he was qualified not only to profit by the expectations he had raised but to fulfil them. - "The Valley of Decision", Edith Wharton.
  3. Indeed, the impetus that was given, by the effects of the shadow, in this way, to humanity in gross, was quite as remarkable as were its contrary tendencies on humanity in detail. - "The Monikins", J. Fenimore Cooper.