'Impacted' definitions:

Definition of 'impacted'

adjective

Wedged or packed in together; "an impacted tooth" [syn: impacted, wedged]

From: GCIDE

Impact \Im*pact"\, 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]
3. To collide forcefully with; to strike. [PJC]

From: GCIDE

Impacted \Im*pact"ed\, a.
1. Driven together or close. [1913 Webster]
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]