impact

I UK [ˈɪmpækt] / US [ˈɪmˌpækt] noun
Word forms "impact":
singular impact plural impacts
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1) [countable] an effect, or an influence

Her paper discusses the likely impact of global warming on climate change.

Tougher environmental laws could have negative impacts on economic growth.

impact on:

Internet shopping has begun to have a serious impact on traditional bookshops.

make an impact:

She's an excellent athlete who is already making a real impact in world competition.

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Collocations:
Adjectives frequently used with impact
▪  adverse, devastating, dramatic, major, negative, profound, serious, significant Verbs frequently used with impact as the object ▪  absorb, cushion, lessen, minimize, soften

2)

a) [countable/uncountable] an occasion when one object hits another

the point of impact

on impact:

The missile exploded on impact.

b) the force with which one objects hits another

I was thrown to the ground by the impact.

II UK [ɪmˈpækt] / US verb [intransitive/transitive]
Word forms "impact":
present tense I/you/we/they impact he/she/it impacts present participle impacting past tense impacted past participle impacted

to have an effect or influence on someone or something

impact on:

The failure of the transport system impacts daily on all our lives.