(redirected from impactions)
Also found in: Thesaurus, Medical, Encyclopedia.


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 ?
Prevalence of third molar impactions in urban population of age 22-30 years in South India: An epidemiological study.
Our results discourage the use of plain film radiography in diagnosing fish and chicken bone impactions in the upper aerodigestive tract, because of the poor sensitivity and specificity of plain radiography to identify fish bones.
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.
Laryngoscopy and rigid endoscopy can be used for proximal impactions, pediatric cases, and those who fail intervention via flexible upper endoscopy.
Patients were divided into three groups based on the site of impaction; there were 9 impactions in the esophagus and 7 each in the nasal cavity and stomach.
The rate of third molar impactions are increasing at an alarming rate with the progress of evolution.
The outcome of certain canine impactions can be unpredictable and challenging if not diagnosed properly.
Foreign body (FB) ingestions and esophageal food bolus impactions are common problems faced by physicians and are frequent reasons for urgent endoscopy.
51%) of all patients with maxillary cuspid, it is estimated that 8% have bilateral impactions.
The reported prognosis for small colon impactions ranges from fair to good with medical treatment.
Most of the studies published on impacted maxillary canines have dealt with characteristics of unilateral impactions [17,18,23], although others conclude that bilateral impaction is more usual [10].
Etiology of esophageal food impactions in children.