[ im-pak-tid ]
/ ɪmˈpæk tɪd /


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.

Origin of impacted

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


non·im·pact·ed, adjectiveun·im·pact·ed, adjective

Definition for impacted (2 of 2)

[ noun im-pakt; verb im-pakt ]
/ noun ˈɪm pækt; verb ɪmˈpækt /


verb (used with object)

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.

Origin of impact

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


non·im·pact, noun, adjectivepost·im·pact, adjective

usage note for impact

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 Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for impacted

British Dictionary definitions for impacted (1 of 2)

/ (ɪmˈpæktɪd) /


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

British Dictionary definitions for impacted (2 of 2)


noun (ˈɪmpækt)

the act of one body, object, etc, striking another; collision
the force with which one thing hits another or with which two objects collide
the impression made by an idea, cultural movement, social group, etcthe impact of the Renaissance on Medieval Europe

verb (ɪmˈpækt)

to drive or press (an object) firmly into (another object, thing, etc) or (of two objects) to be driven or pressed firmly together
to have an impact or strong effect (on)

Derived forms of impact

impaction, noun

Word Origin for impact

C18: from Latin impactus pushed against, fastened on, from impingere to thrust at, from pangere to drive in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for impacted

[ ĭm-păktĭd ]


Wedged together at the broken ends. Used of a fractured bone.
Placed in the alveolus in a manner prohibiting eruption into a normal position. Used of a tooth.
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.