impaction

US: (im pak′shən)

WordReference Random House Unabridged Dictionary of American English © 2026

im•pac•tion  (im pak′shən), n. 

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

• Late Latin impāctiōn- (stem of impāctiō), equivalent. to Latin impāct(us), past participle of impingere (see impacted) + -iōn- -ion
• 1730–40