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English definition of “prerequisite”

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prerequisite

noun [C] uk   /ˌpriːˈrek.wɪ.zɪt/ formal us  
something that must exist or happen before something else can exist or happen: Passing a written exam is a prerequisite for taking the advanced course. Public support is a prerequisite for/to the success of this project. They had to agree to certain conditions as a prerequisite of being lent the money.
(Definition of prerequisite from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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