- substitution, permutation, transposition, replacement, switch - an event in which one thing is substituted for another; "the replacement of lost blood by a transfusion of donor blood"
--1 is a kind of variation, fluctuation
Derived forms: verb substitute2, verb substitute1 - substitution, exchange, commutation - 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 is a kind of change
--2 has particulars:replacement, replacing; subrogation; weaning, ablactation Derived form: verb substitute1