impaction meaning and definition

IMPACTION noun

Definition of impaction (noun)

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