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English definition of “trial and error”

trial and error

noun [U]    
C2 a way of achieving an aim or solving a problem by trying a number of different methods and learning from the mistakes that you make: There's no instant way of finding a cure - it's just a process of trial and error .Effort and expending energyTrying and making an effort
(Definition of trial and error noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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