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substitution

noun [C or U]
 
 
/ˌsʌb.stɪˈtjuː.ʃən/ US  /-ˈtuː-/

Definition

C1 the use of one person or thing instead of another: It looks as though the coach is going to make a substitution (= change one player for another in the game).Replacing and exchanging
(Definition of substitution noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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