[ im-pak-shuh n ]
/ ɪmˈpæk ʃən /


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

Origin of impaction

1730–40; < Late Latin impāctiōn- (stem of impāctiō), equivalent to Latin impāct(us), past participle of impingere (see impacted) + -iōn- -ion Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Examples from the Web for impaction

Medical definitions for impaction

[ ĭm-păkshən ]


The process or condition of being impacted.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.