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English definition of “substitute”

substitute

verb     /ˈsʌb.stɪ.tjuːt/ US  /-tuːt/
B2 [T] to use something or someone instead of another thing or person: You can substitute oil for butter in this recipe. Dayton was substituted for Williams in the second half of the match.Replacing and exchanging substitute for sth to perform the same job as another thing or to take its place: Gas-fired power stations will substitute for less efficient coal-fired equipment.Replacing and exchanging
(Definition of substitute verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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