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.

Having impact.

Of, pertaining to, possessing, or caused by impact.

The quality of being impactful.

Likely to be impacted.

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.

plural of impaction

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