noun
a thing that is required as a prior condition for something else to happen or exist
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Completing the introductory course is a prerequisite for enrolling in the advanced class.
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You have to pass the beginner's level first before moving on to the next stage - it's a prerequisite.
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You can't skip the basic stuff, it's a prerequisite to get to the good stuff.
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Building a strong foundation is a prerequisite for success in any field.