substitution

Noun

Synonyms: permutation transposition replacement switch exchange commutation

WordNet 3.0

Noun (2)

an event in which one thing is substituted for another“the replacement of lost blood by a transfusion of donor blood”Synonyms: permutation transposition replacement switch
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: exchange commutation

Webster's Dictionary (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]