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substitution

The noun substitution refers to the act of replacing one thing with another. Your football coach might make a substitution by sending you onto the field to take over for a player who is tired or injured.

Substitution comes from the Middle French word of the same spelling, meaning "a putting in place of another." You might notice that substitution contains the root word substitute, and that's a good way to remember the meaning of the word. In school, a substitute is a temporary teacher who fills in when your regular teacher is out — in other words, a substitution has been made until your teacher returns.

Definitions of substitution
  1. noun
    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"
    synonyms: commutation, exchange
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    types:
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    replacement, replacing
    the act of furnishing an equivalent person or thing in the place of another
    subrogation
    (law) the act of substituting of one creditor for another
    ablactation, weaning
    the act of substituting other food for the mother's milk in the diet of a child or young mammal
    novation
    (law) the replacement of one obligation by another by mutual agreement of both parties; usually the replacement of one of the original parties to a contract with the consent of the remaining party
    pitching change
    replacing a pitcher in baseball
    supersedure, supersession
    act of replacing one person or thing by another especially one held to be superior
    displacement, supplanting
    act of taking the place of another especially using underhanded tactics
    type of:
    change
    the action of changing something
  2. noun
    an event in which one thing is substituted for another
    synonyms: permutation, replacement, switch, transposition
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    type of:
    fluctuation, variation
    an instance of change; the rate or magnitude of change
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