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[im-pak-shuh n] /ɪmˈpæk ʃən/

an act or instance of .
the state of being ; close fixation.
Dentistry. the condition in which a tooth is .

1739, from Latin impactionem (nominative impactio) “a striking against,” noun of action from past participle stem of impingere (see impinge).

impaction im·pac·tion (ĭm-pāk’shən)
The process or condition of being impacted.


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  • Impactite

    [im-pak-tahyt, im-pak-tahyt] /ɪmˈpæk taɪt, ˈɪm pækˌtaɪt/ noun 1. a glassy or crystalline material composed of slag and meteoric materials, produced by the of a meteorite striking the earth.

  • Impactive

    [im-pak-tiv] /ɪmˈpæk tɪv/ adjective 1. caused by : impactive pain. 2. compelling or impressive: He was deeply moved by the impactive force of the performance. /ɪmˈpæktɪv/ adjective 1. of or relating to a physical impact 2. making a strong impression

  • Impact-parameter

    noun, (in nuclear physics) 1. the perpendicular distance from the original center of a set of scattering particles to the original line of motion of a particle being scattered.

  • Impactor

    [im-pak-ter] /ɪmˈpæk tər/ noun 1. a person or thing that . 2. . noun 1. an electric or pneumatic power wrench with interchangeable toolhead attachments, used for installing and removing nuts, bolts, and screws.

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