The striking of one body against another; collision. / The force or energy of a collision of two objects. / (chiefly medicine) A forced impinging.

(transitive) To collide or strike, the act of impinging. / (transitive) To compress; to compact; to press into something or pack together.

Compression; the packing together of loose matter. / something packed together tightly; a mass of densely-packed matter / (medicine) A solid, immobile bulk of stool.

plural of impaction

plural of impact

Third-person singular simple present indicative form of impact

simple past tense and past participle of impact

Having undergone an impact. / (dentistry) Of a tooth, subject to dental impaction. / (US, economics) Having lost property revenue due to Federal presence, such that it may receive impact aid.

present participle of impact

Having impact.