1. [noun] (obsolete) A passing from one state to another; change; alteration; mutation.
2. [noun] (obsolete) The act of giving one thing for another; barter; exchange.
3. [noun] (formal or archaic) Substitution of one thing for another; interchange.
4. [noun] Specifically, the substitution of one kind of payment for another, especially a switch to monetary payment from obligations of labour.
5. [noun] (legal) The change to a lesser penalty or punishment by the State
6. [noun] (linguistics) Substitution, as a means of discriminating between phonemes.
7. [noun] (electronics) The reversal of an electric current.
8. [noun] The travel of a commuter.
9. [noun] A warrant substituting a lesser punishment for a greater one.
10. [noun] (law) the reduction in severity of a punishment imposed by law.
11. [noun] 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'.
