■ verb
1》 travel some distance between one's home and place of work on a regular basis.
2》 reduce (a judicial sentence, especially a sentence of death) to a less severe one.
↘change one kind of payment or obligation for (another).
↘replace (an annuity or other series of payments) with a single payment.
3》 Mathematics (of two operations or quantities) have a commutative relation.
Derivatives
commutable adjective
~r noun
Origin
ME: from L. commutare , from com- 'altogether' + mutare 'to change'; sense 1 derives from commutation ticket , the US term for a season ticket (because the daily fare is ~d to a single payment).