replacement
noun
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the act of furnishing an equivalent person or thing in the place of anotherreplacing
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a person or thing that takes or can take the place of anothersubstitute
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an event in which one thing is substituted for another“the replacement of lost blood by a transfusion of donor blood”transposition
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a person who follows next in ordersuccessor
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someone who takes the place of another personsurrogatealternate
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filling again by supplying what has been used uprenewalrefillingreplenishment