- 1 [intransitive, transitive] to have an effect on something synonym affect impact on/upon something Her father's death impacted greatly on her childhood years. impact something (business) The company's performance was impacted by the high value of the dollar.
- 2[intransitive, transitive] impact (on/upon/with) something (formal) to hit something with great force
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NAmE//ɪmˈpækt//Verb Forms present simple I / you / we / they impact
he / she / it impacts
past simple impacted
-ing form impacting