Definition: impact

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Source: WordNet (r) 1.7 

impact
     n 1: the striking of one body against another
     2: a forceful consequence; "the book had an important impact on
        my thinking"
     3: influencing strongly: "they resented the impingement of
        American values on European culture" [syn: impingement,
        encroachment]
     4: the violent interaction of individuals or groups entering
        into combat [syn: shock]
     v 1: press or wedge together; pack together
     2: have an effect upon; "Will the new rules affect me?" [syn: affect,
         bear upon, bear on, touch on, touch]

Source: Webster's Revised Unabridged Dictionary (1913) 

Impact \Im"pact\, n.
   1. Contact or impression by touch; collision; forcible
      contact; force communicated.

            The quarrel, by that impact driven.   --Southey.

   2. (Mech.) The single instantaneous stroke of a body in
      motion against another either in motion or at rest.
Impact \Im*pact"\, v. t. [imp. & p. p. Impacted; p. pr. & vb.
   n. Impacting.] [L. impactus, p. p. of impingere to push,
   strike against. See Impinge.]
   To drive close; to press firmly together: to wedge into a
   place. --Woodward.

Source: V.E.R.A. -- Virtual Entity of Relevant Acronyms December 2001 

IMPACT
        Information Market Policy ACTions (ECHO)

Source: U.S. Gazetteer (1990) 

Impact, TX (town, FIPS 35816)
  Location: 32.49875 N, 99.74627 W
  Population (1990): 25 (13 housing units)
  Area: 0.2 sq km (land), 0.0 sq km (water)