Impetus
WordNet

noun


(1)   The act of applying force suddenly
"The impulse knocked him over"
(2)   A force that moves something along
WiktionaryText

Noun



  1. Something that impels, a stimulating factor.
    The outbreak of World War II in 1939 gave a new impetus to receiver development.
  2. A force, either internal or external, that impels; an impulse.
  3. The force or energy associated with a moving body; a stimulus.
  4. An activity in response to a stimulus.
 
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