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Noun: impaction  im'pak-shun
  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