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English definition of “instant”

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instant

adjective uk   /ˈɪn.stənt/ us  
B2 happening immediately, without any delay: This type of account offers you instant access to your money. Contrary to expectations, the film was an instant success. Instant food or drink is dried, usually in the form of a powder, and can be prepared very quickly by adding hot water: instant coffee/soup
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instant

noun [S] uk   /ˈɪn.stənt/ us  
an extremely short period of time: In an instant her mood had changed. The startled boy froze for an instant, then fled. "Stop that noise this instant (= now)!" I'll call you the instant (= as soon as) I get home.
Synonym
(Definition of instant from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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