Longman Dictionary of Contemporary English homepage

substitution

 noun
     
sub‧sti‧tu‧tion [uncountable and countable]
when someone or something is replaced by someone or something else:
Coach Ross made two substitutions in the second half.
substitution of something for something
the substitution of English for French as the world's common language
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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