Definition of commutations:
(n) :
(US, nonstandard) The process or habit of journeying to and from work on a regular basis; commuting.
(n) :
Specifically, the substitution of one kind of payment for another, especially a switch to monetary payment from obligations of labour.
(n) :
(law) The change to a lesser penalty or punishment by the State
(n) :
(formal or archaic) Substitution of one thing for another; interchange.
(n) :
(linguistics) Substitution, as a means of discriminating between phonemes.
(n) :
(electronics) The reversal of an electric current.