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English definition of “replacement”

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noun uk   /rɪˈpleɪs.mənt/ us  
C1 [U] the process of replacing something with something else: the replacement of existing computer equipment replacement windowsB2 [C] someone who does a job instead of someone else, or something that you use instead of something else: The agency sent a replacement for the secretary who resigned.[C] in sports, a player who is used for part of a game instead of another player
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(Definition of replacement from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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