Definition: a person or thing that encourages action
Part of Speech: Noun
Synonym(s): boost, encouragement
Antonym(s): counterincentive, disincentive
1. The large reward is an impetus which should send many calls to the police station.
2. Do you think the new treaty will give impetus to trade?
3. The killing of the unarmed man was the impetus for an investigation of the local police force.