1. The condition of being pressed closely together and firmly fixed
   "The impaction of wisdom teeth often causes pain and requires surgical removal"
    
2. A sharp collision produced by striking or dashing against something
   "The impaction of the ball on the bat produced a loud crack";
   - impingement
    
3. A disorder in which faeces are impacted in the lower colon
   "The elderly patient suffered from impaction, requiring medical intervention"
    
4. A disorder in which a tooth is so crowded in its socket that it cannot erupt normally
   "The dentist recommended surgery to remove the impaction";
   - impacted tooth

Derived forms: impactions

Type of: condition, crash, disorder, smash, status, upset

Encyclopedia: Impaction