Merriam-Webster Online Dictionary
impact (verb)transitive verb
1.
a) to fix firmly by or as if by packing or wedging
b) to press together
2.
a) to have a direct effect or impact on impinge on
intransitive verb
b) to strike forcefully , also to cause to strike forcefully
1.
to have an impact - often used with on
2.
to impinge or make contact especially forcefully
1.
a) an impinging or striking especially of one body against another
b) a forceful contact or onset , also the impetus communicated in or as if in such a contact
2.
the force of impression of one thing on another a significant or major effect - the impact of science on our society an environmental impact study
