Substitution - Definition
substitution
n 1: 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]
2: 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]