impaction Meaning, Definition & Usage

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

WordNet

Im*pac"tion noun
Etymology
L. impactio a striking : cf. F. impaction.
Definitions
  1. (Surg.) The driving of one fragment of bone into another so that the fragments are not movable upon each other; as, impaction of the skull or of the hip.
  2. An immovable packing; (Med.), a lodgment of something in a strait or passage of the body; as, impaction of the fetal head in the strait of the pelvis; impaction of food or feces in the intestines of man or beast.

Webster 1913