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Noun impulsion has 2 senses
  1. drift, impetus, impulsion - a force that moves something along
    --1 is a kind of force
    Derived form: verb impel1
  2. impulse, impulsion, impetus - the act of applying force suddenly; "the impulse knocked him over"
    --2 is a kind of drive, thrust, driving force
    Derived form: verb impel2
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