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Noun: substitution  ,súb-sti't(y)oo-shun
  1. An event in which one thing is substituted for another
    "the substitution of lost blood by a transfusion of donor blood";
    - permutation, transposition, replacement, switch
     
  2. 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";
    - exchange, commutation

Derived forms: substitutions

Type of: change, fluctuation, variation

Encyclopedia: Substitution