v. t. [ imp. & p. p. Impacted; p. pr. & vb. n. Impacting. ] [ L. impactus, p. p. of impingere to push, strike against. See Impinge. ] 1. To drive close; to press firmly together: to wedge into a place. Woodward. [ 1913 Webster ]
2. To affect or influence, especially in a significant or undesirable manner; as, budget cuts impacted the entire research program; the fish populations were adversely impacted by pollution. [ PJC ]
2.Specifically: (Dentistry) Grown in an abnormal direction so that it is wedged against another tooth and cannot erupt normally; -- of teeth, especially the third molar; as, to extract an impacted third molar. [ PJC ]
Impacted fracture (Surg.), a fracture in which the fragments are driven into each other so as to be immovable. [ 1913 Webster ]
n. [ L. impactio a striking : cf. F. impaction. ] 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. [ 1913 Webster ]
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. [ 1913 Webster ]
[えいきょう, eikyou](n) (1) influence; effect; (vs) (2) to influence; to affect; to have an influence on; to impact; to have an effect on; (P)#666[Add to Longdo]