Definitions
1.nounA passing from one state to another; change; alteration; mutation.
2.nounThe act of giving one thing for another; barter; exchange.
3.nounSubstitution of one thing for another; interchange.
4.nounSpecifically, the substitution of one kind of payment for another, especially a switch to monetary payment from obligations of labour.
5.nounThe change to a lesser penalty or punishment by the State
6.nounSubstitution, as a means of discriminating between phonemes.
7.nounThe reversal of an electric current.