tightly or immovably wedged in.
Dentistry. noting a tooth so confined in its socket as to be incapable of normal eruption.
driven together; tightly packed.
densely populated or crowded; overcrowded: an impacted school district.

1675–85; obsolete impact adj. (< Latin impāctus past participle of impingere to fasten, cause to collide, strike, equivalent to im- im-1 + pag-, variant stem of pangere to drive in, plant firmly + -tus past participle suffix) + -ed2; see impinge

nonimpacted, adjective
unimpacted, adjective Unabridged


[n. im-pakt; v. im-pakt]
the striking of one thing against another; forceful contact; collision: The impact of the colliding cars broke the windshield.
an impinging: the impact of light on the eye.
influence; effect: the impact of Einstein on modern physics.
an impacting; forcible impinging: the tremendous impact of the shot.
the force exerted by a new idea, concept, technology, or ideology: the impact of the industrial revolution.
verb (used with object)
to drive or press closely or firmly into something; pack in.
to fill up; congest; throng: A vast crowd impacted St. Peter's Square.
to collide with; strike forcefully: a rocket designed to impact the planet Mars.
to have an impact or effect on; influence; alter: The decision may impact your whole career. The auto industry will be impacted by the new labor agreements.
verb (used without object)
to have impact or make contact forcefully: The ball impacted against the bat with a loud noise.
to have an impact or effect: Increased demand will impact on sales.

1775–85; (noun and v.) back formation from impacted

nonimpact, noun, adjective
postimpact, adjective

The verb impact has developed the transitive sense “to have an impact or effect on” (The structured reading program has done more to impact the elementary schools than any other single factor) and the intransitive sense “to have an impact or effect” (The work done at the computer center will impact on the economy of Illinois and the nation). Although recent, the new uses are entirely standard and most likely to occur in formal speech and writing. See also impactful. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To impacted
World English Dictionary
1.  the act of one body, object, etc, striking another; collision
2.  the force with which one thing hits another or with which two objects collide
3.  the impression made by an idea, cultural movement, social group, etc: the impact of the Renaissance on Medieval Europe
4.  to drive or press (an object) firmly into (another object, thing, etc) or (of two objects) to be driven or pressed firmly together
5.  to have an impact or strong effect (on)
[C18: from Latin impactus pushed against, fastened on, from impingere to thrust at, from pangere to drive in]

impacted (ɪmˈpæktɪd)
1.  (of a tooth) unable to erupt, esp because of being wedged against another tooth below the gum
2.  (of a fracture) having the jagged broken ends wedged into each other

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, "press closely into something," from L. impactus, pp. of impingere "to push into, dash against" (see impinge). Originally sense preserved in impacted teeth (1876). Sense of "strike forcefully against something" first recorded 1916. Figurative sense began with use
as a noun (1817, first in Coleridge) meaning "effect of coming into contact with a thing or person."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

impacted im·pact·ed (ĭm-pāk'tĭd)

  1. Wedged together at the broken ends. Used of a fractured bone.

  2. Placed in the alveolus in a manner prohibiting eruption into a normal position. Used of a tooth.

  3. Packed in or wedged in such a manner so as to fill or block an organ or a passage.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In severely impacted communities, one of two scenarios is likely to prevail.
Predictably, the tourist boom has impacted the area.
She is doing what is best for her home life, which is greatly impacted due to
  her job.
It's been a cliché that sports are too ingrained in the culture to be impacted
  by a recession.
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