Webster's English Dictionary

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impact

1. im.pact \im-'pakt\ vt [L impactus, pp. of impingere to push against - 
   more at IMPING]E 1a: to fix firmly by or as if by packing or wedging  1b: 
   to press together  2: to impinge upon 
2. im.pact \'im-.pakt\ n 1a: an impinging or striking (as of one body 
   against another)  1b: a forceful contact, collision, or onset; also : the 
   impetus com municated in or as if in a collision 2: the force of impression 
   or operation of one thing on another : EFFE CT