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English word:    

substitution

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substitution in WordNet English dictionary

noun
  1. the act of putting one thing or person in the place of another: "he sent Smith in for Jones but the substitution came too late to help"
    substitution  exchange  commutation 
  2. an event in which one thing is substituted for another
    "the replacement of lost blood by a transfusion of donor blood"
    substitution  permutation  transposition  replacement  switch 
WordNet Lexical Database v3.0, © 2006 Princeton University