6 days ago · impact, collision, shock, concussion mean a forceful, even violent contact between two or more things. impact may be used to imply contact between two things, at least one of which is … IMPACT definition: 1. the force or action of one object hitting another: 2. a powerful effect that something…. the act of one body, object, etc, striking another; collision 2. the force with which one thing hits another or with which two objects collide The impact that something has on a situation, process, or person is a sudden and powerful effect that it has on them. They say they expect the meeting to have a marked impact on the future of the country. Definition of impact in the Definitions.net dictionary. What does impact mean? Information and translations of impact in the most comprehensive dictionary definitions resource on … Definition of impact noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. collision: The impact of the colliding cars broke the windshield. an impinging: the impact of light on the eye. influence; effect: the impact of Einstein on modern physics.