<p><strong>Noun</strong></p><ul><li>The act of substituting one thing for another; substitution; exchange</li><li>The changing of a prison sentence or other penalty to another less severe</li><li>The act of commuting, as to and from a place of work</li><li>The substitution of one kind of payment for another</li><li>(Electricity) The act or process of commutating</li><li>(Also called commutation test)</li><li>(Linguistics) The technique, especially in phonological analysis, of substituting one linguistic item for another while keeping the surrounding elements constant, used as a means of determining the constituent units in a sequence and their contrasts with other units</li></ul>