mid-15c., "to change, transform," from Latin commutare "to often change, to change altogether," from com-, intensive prefix (see com-), + mutare "to change" (from PIE root *mei- (1) "to change, go, move"). Sense of "make less severe" is 1630s. Sense of "go back and forth to work" is 1889, from commutation ticket "season pass" (on a railroad, streetcar line, etc.), from commute in its sense of "to change one kind of payment into another" (1795), especially "to combine a number of payments into a single one." Related: Commuted; commuting.
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