substitution meaning and definition

SUBSTITUTION noun

Definition of substitution (noun)

1. an event in which one thing is substituted for another
   • "the replacement of lost blood by a transfusion of donor blood"
   • synonyms: permutation, replacement, switch, transposition
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"
   • synonyms: commutation, exchange