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a. The striking of one body against another; collision. See Synonyms at collision.
b. The force transmitted by a collision.
2. The effect or impression of one person or thing on another: still gauging the impact of automation on the lives of factory workers.
v. (ĭm-păkt′, ĭm′păkt′) im·pact·ed, im·pact·ing, im·pacts
1. To pack firmly together.
2. To strike forcefully: meteorites impacting the lunar surface.
3. To have an effect or impact on: "No region ... has been more impacted by emerging ... economic trends" (Joel Kotkin).
To have an effect or impact. See Usage Note below.

[From Latin impāctus, past participle of impingere, to push against; see impinge.]

im·pac′tion n.
Usage Note: Impact in the figurative sense of "a dramatic effect" came under criticism in the 1960s, both as a noun and verb. Complaints that the noun was a pointless hyperbole and a vogue word turned out to be short-lived, and this usage is now is standard: in our 2015 survey, 97 percent of the Usage Panel accepted The program might have a positive impact on our nation's youth. (A similar sentence was accepted by 93 percent of the Panel in 2001.) The verb is a different matter. Many people dislike it because they assume it was converted from the noun in the manner of voguish and bureaucratic words like dialogue and interface, but in fact impact was a verb long before it was a noun—the verb dates from the early 1600s, the noun from the late 1700s. Most of the Panelists still disapprove of the intransitive use of the verb meaning "to have an effect": in our 2015 survey, 78 percent of the Panel (down only slightly from 85 percent in 2001) rejected These policies are impacting on our ability to achieve success. The transitive version was once as vilified, but is gradually becoming more acceptable: in 2015, only 50 percent (down from 80 percent in 2001) rejected The court ruling will impact the education of minority students, and only 39 percent (down from 66 percent in 2001) found the literal sense unacceptable in the sentence Thousands of meteors have impacted the lunar surface. Although resistance to the transitive senses is waning, the intransitive use is still strongly disliked and is best avoided. See Usage Notes at contact, impactful.


(ɪmˈpæk ʃən)

1. an act or instance of impacting.
2. the state of being impacted.
[1730–40; < Late Latin]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.impaction - the condition of being pressed closely together and firmly fixed
condition, status - a state at a particular time; "a condition (or state) of disrepair"; "the current status of the arms negotiations"
2.impaction - a disorder in which feces are impacted in the lower colon
disorder, upset - a physical condition in which there is a disturbance of normal functioning; "the doctor prescribed some medicine for the disorder"; "everyone gets stomach upsets from time to time"
3.impaction - a disorder in which a tooth is so crowded in its socket that it cannot erupt normally
disorder, upset - a physical condition in which there is a disturbance of normal functioning; "the doctor prescribed some medicine for the disorder"; "everyone gets stomach upsets from time to time"
4.impaction - a sharp collision produced by striking or dashing against something
crash, smash - the act of colliding with something; "his crash through the window"; "the fullback's smash into the defensive line"


n. impacción.
1. condición de estar alojado o metido con firmeza en un espacio limitado;
2. impedimento de un órgano o parte.


n impactación f; cerumen — tapón de cerumen; dental — inclusión dentaria; fecal — impactación fecal
References in periodicals archive ?
One of the case report suggests, lack of eruptive force and rotation of tooth buds to be the main causative factor for multiple impactions in non syndromic patients.
However, in exceptional cases they can cause perforation, impaction, bleeding, and fistula formation, depending on the foreign body\'s size, shape, and nature.2,3 Food bolus impaction is common with meat, fish bones, and in a few cases it is fruits.4 Food bolus impaction is seen in old people with poor natural teeth or ill-fitting dentures, or inadequate mastication as in our case.4 The majority of foreign bodies that reach the GI tract, true foreign objects and food bolus impactions, will pass spontaneously.
The benefits are tremendous - we have fewer fecal impactions, less urinary tract infections, fewer enemas, etc.
In present study 85 % of impactions were unilateral and 15% were bilateral.
Consuming materials that induce impactions in domestic birds may be caused by primary enteric disease, inadequate feed availability, nutritional deficiencies, stress, and movement to a new environment with a new substrate.
The necessity of removing large impactions is the unfortunate result.
Among patients having maxillary canine impactions, females are more than twice affected in comparison to males.
Mesioangular impactions show the highest rate of occurrence (70%), while distoangular impactions (6%) show the lowest rate of occurrence.
The 15-25 years age group (22.48+1.6) had the highest prevalence of tooth impactions (65.78%) followed by 28.94% of patients which aged between 26 to 35 years (31.09+ 3.08) and than those age 36 to 45 years (43.5+ 2.12)were only 5.26%.
Management of ingested foreign bodies and food impactions. Gastrointes Endosc 2011; 73: 1085-91.
Abstract: Four captive raptors, an American kestrel (Falco sparverius), peregrine falcon (Falco peregrinus), golden eagle (Aquila chrysaetos), and barn owl (Tyto alba), were diagnosed with ventricular and/or proventricular foreign material impactions consisting of artificial turf substrate, paper and plastic substrate, grass, and newspaper.
Modica, "Retrospective analysis of management of ingested foreign bodies and food impactions in emergency endoscopic setting in adults," BMC Emergency Medicine, vol.