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English definition of “trial and error”

trial and error

noun [U]  /ˈtrɑɪ·əl ən ˈer·ər, ˈtrɑɪl/ us  
a way of achieving an aim or solving a problem by trying different methods and learning from your mistakes: In a language lab, students learn by trial and error.
(Definition of trial and error from the Cambridge Academic Content Dictionary © Cambridge University Press)
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