/ kəˈmjuːtəbl; NAmE / adjective
1.
( of a place or a distance ) close enough or short enough to make travelling to work every day a possibility
2.
( law ) a commutable punishment can be made less severe
3.
( formal ) able to be changed
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WORD ORIGIN
mid 17th cent. (in sense 3): from Latin commutabilis , from commutare exchange, interchange from com- altogether + mutare to change. Sense 1 dates from the 1970s.