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Feb 14, 2012
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Dictionary


im•pac•tion



Pronunciation: (im-pak'shun), [key]
—n.
1. an act or instance of impacting.
2. the state of being impacted; close fixation.
3. Dentistry.the condition in which a tooth is impacted.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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