WordWeb Online

1. The condition of being pressed closely together and firmly fixed
    
2. A disorder in which faeces are impacted in the lower colon
    
3. A disorder in which a tooth is so crowded in its socket that it cannot erupt normally
   - impacted tooth
    
4. A sharp collision produced by striking or dashing against something
   - impingement

Derived forms: impactions

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

Encyclopedia: Impaction