Dictionaryim•pact•edPronunciation: (im-pak'tid), [key] —adj. 1. tightly or immovably wedged in. 2. Dentistry.noting a tooth so confined in its socket as to be incapable of normal eruption. 3. driven together; tightly packed. 4. densely populated or crowded; overcrowded: an impacted school district. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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