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impaction (n.)

1739, from Latin impactionem (nominative impactio) "a striking against," noun of action from past participle stem of impingere "drive into, strike against" (see impinge).

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Definitions of impaction from WordNet

impaction (n.)
the condition of being pressed closely together and firmly fixed;
impaction (n.)
a disorder in which feces are impacted in the lower colon;
impaction (n.)
a disorder in which a tooth is so crowded in its socket that it cannot erupt normally;
Synonyms: impacted tooth
impaction (n.)
a sharp collision produced by striking or dashing against something;
Synonyms: impingement
From wordnet.princeton.edu