IMPACTION

• (noun) a sharp collision produced by striking or dashing against something

  synonyms : impingement

• (noun) a disorder in which a tooth is so crowded in its socket that it cannot erupt normally

  synonyms : impacted tooth

• (noun) a disorder in which feces are impacted in the lower colon

• (noun) the condition of being pressed closely together and firmly fixed

WordNet® 3.0, © 2006 by Princeton University.

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