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Synonyms
im·pe·tus (ĭḿpĭ-təs)

[Middle English impetous, from Latin impetus, from impetere, to attack, in-, against; see in–2, + petere, to go towards, seek.]

noun: pl., -tus·es. 

  1. An impelling force; an impulse.
  2. The force or energy associated with a moving body.
    1. Something that incites; a stimulus.
    2. Increased activity in response to a stimulus: The approaching deadline gave impetus to the investigation.