Prequel definitions

prē'kwəl
A literary, dramatic, or cinematic work whose narrative takes place before that of a preexisting work.
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A novel (or film, etc.) about events that preceded and, often, led up to those of another that was published (or produced) earlier.
noun
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(narratology) In a series of works, an installment that is set chronologically before its predecessor, especially the original narrative or (perhaps improper usage) any narrative work with at least one sequel.
noun
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Origin of prequel

Patterned after sequel using pre- (“before").