1. (im′pakt)The forcible striking of one body against another. 2. (im-pakt′)To press two bodies, parts, or fragments closely together so that the two parts move as a single unit. [L. impingo, pp. -pactus, to strike at (in + pango), fasten, drive in]
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Immunisation Monitoring Programme Active [Canada]; Initiatives to Mobilize for the Prevention and Control of Tobacco Use; Integrilin to Minimize Platelet Aggregation and Prevent Coronary Thrombosis [trial]; Interdisciplinary Maternal Perinatal Australasian Clinical Trials; International Mexiletine and Placebo Antiarrhythmia Coronary Trial
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im·pact (imґpakt) [L. impactus] a sudden and forcible collision.Medical dictionary. 2011.