Longman Dictionary of Contemporary English homepage

replacement

 noun
     
re‧place‧ment W3
1 [uncountable] when you get something that is newer or better than the one you had before:
Our old car is badly in need of replacement.
replacement windows
2

knee/hip/joint replacement

an artificial knee etc that replaces a damaged one, given to people in a medical operation
3 [countable] someone or something that replaces another person or thing
replacement for
It was difficult to find a replacement for Ted.
Definition from the Longman Dictionary of Contemporary English
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