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.
a tooth that has failed to erupt into the oral cavity; in orthodontics this often describes maxillary canines and third permanent molars that occupy a position from which normal eruption is highly unlikely
Refers to those majors that receive more applications during the initial application filing period than there are spaces available. A major may be impacted on one campus, several campuses, or all campuses where it is offered.