Impact

[ noun im-pakt; verb im-pakt ] 

noun 

1 the striking of one thing against another; forceful contact; collision: The impact of the colliding cars broke the windshield. 

2 an impinging: the impact of light on the eye. 

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verb (used without object) 

1 to have impact or make contact forcefully: The ball impacted against the bat with a loud noise. 

2 to have an impact or effect: Increased demand will impact on sales.