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substitution

Nouns

• (n) an event in which one thing is substituted for another
  • the replacement of lost blood by a transfusion of donor blood
  permutation, switch, transposition, replacement,
• (n) 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" commutation, exchange,

Synonyms

permutation switch transposition replacement commutation exchange

Words of close approximity