› formal the process of doing something again and again, usually to improve it, or one of the times you do it: the repetition and iteration that goes on in designing something The software is on its fifth iteration.Repeating an action › specialized mathematics, computing an amount that you get when you use a mathematical rule several timesNumerical relationshipsRepeating an action

(Definition of iteration from the Cambridge Advanced Learners Dictionary & Thesaurus
© Cambridge University Press)

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