definition of
impaction

[1] #1 impaction n. the condition of being pressed closely together and firmly fixed. wn

[2] #2 impaction n. a disorder in which feces are impacted in the lower colon. wn

[3] #3 impaction n. [impacted tooth] a disorder in which a tooth is so crowded in its socket that it cannot erupt normally. wn

[4] #4 impaction n. [impingement] a sharp collision produced by striking or dashing against something. wn