Definition

1. Noun:
   • The act of replacing one thing or person with another: "substitution" refers to the process or action of taking something or someone out and putting a different thing or person in its place.
   • An instance of such replacement: "substitution" can also refer to a specific event or occurrence where one element is exchanged for another.

Examples of Usage

• Noun:
  • The coach made a smart substitution in the second half, bringing on a fresh striker.
  • The recipe allows for the substitution of honey for sugar if you prefer.
  • The substitution of plastic for glass made the product much lighter.

Advanced Usage

• In mathematics and logic: The replacement of a variable with a specific value or expression.
  • To solve the equation, perform the substitution of x with the number 5.
• In chemistry: A reaction where an atom or group in a molecule is replaced by another atom or group.
  • A nucleophilic substitution is a fundamental type of reaction in organic chemistry.

Variants and Related Words

• Substitute (verb/noun): To act or serve as a replacement; a person or thing that takes the place of another.
  • She will substitute for the regular teacher today. (verb)
  • Tofu can be a good substitute for meat. (noun)
• Substitutional (adjective): Relating to or involving substitution.
  • The team analyzed the substitutional effects of the new policy.

Synonyms

• Replacement: The action or process of replacing someone or something.
• Exchange: An act of giving one thing and receiving another in its place.
• Swap: To take part in an exchange of.

Related Phrases

• As a substitute for: In place of, instead of.
  • He used yogurt as a substitute for sour cream in the recipe.
• In substitution for: Formal phrase meaning as a replacement for.
  • The court ordered community service in substitution for a fine.

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"
2. an event in which one thing is substituted for another
   • the replacement of lost blood by a transfusion of donor blood