'Substitution' definitions:

Definition of 'substitution'

From: WordNet
noun
An event in which one thing is substituted for another; "the replacement of lost blood by a transfusion of donor blood" [syn: substitution, permutation, transposition, replacement, switch]
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" [syn: substitution, exchange, commutation]

Definition of 'Substitution'

From: GCIDE
  • Substitution \Sub`sti*tu"tion\, n. [L. substitutio: cf. F. substitution.]
  • 1. The act of substituting or putting one person or thing in the place of another; as, the substitution of an agent, attorney, or representative to act for one in his absense; the substitution of bank notes for gold and silver as a circulating medium. [1913 Webster]
  • 2. The state of being substituted for another. [1913 Webster]
  • 3. The office or authority of one acting for another; delegated authority. [R.] --Shak. [1913 Webster]
  • 4. (Civil Law) The designation of a person in a will to take a devise or legacy, either on failure of a former devisee or legatee by incapacity or unwillingness to accept, or after him. --Burrill. [1913 Webster]
  • 5. (Theol.) The doctrine that Christ suffered vicariously, being substituted for the sinner, and that his sufferings were expiatory. [1913 Webster]
  • 6. (Chem.) The act or process of substituting an atom or radical for another atom or radical; metathesis; also, the state of being so substituted. See Metathesis. [1913 Webster]