Definition from Wiktionary, the free dictionary
See also ímpetus
impetus (plural impetuses)
- Something that impels, a stimulating factor.
- The outbreak of World War II in 1939 gave a new impetus to receiver development.
- 2011, Phil McNulty, Euro 2012: Montenegro 2-2 England 
- In a single moment Montenegro and their supporters were given fresh impetus and encouragement. Beciraj tested Hart with a low shot before teenager Phil Jones, on his England debut, suffered an anxious moment when Stevan Jovetic went down under his challenge, leaving the youngster clearly relieved to see referee Stark wave away Montenegro's appeals.
- A force, either internal or external, that impels; an impulse.
- The force or energy associated with a moving body; a stimulus.
- An activity in response to a stimulus.
something that impels
internal or external force
force or energy associated with a moving body
Related terms 
- impetus in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
- impetus in The Century Dictionary, The Century Co., New York, 1911
- impetus at OneLook Dictionary Search
impetus (genitive impetūs); m, fourth declension
- an attack
- Spanish: ímpetu