Life would be easier if definitions of words were consistent in all uses. Unfortunately, that doesn't always happen. Take the word "permanent" for example. Webster's New World Collegiate Dictionary offers as its main definition, lasting or intended to last indefinitely without change.
In that context, it seems logical to expect that if one spouse in a Minnesota divorce agrees or is ordered to pay spousal support to the other spouse on a permanent basis, that the payments will last indefinitely. However, in the dissolution of marriage process, permanent can unexpectedly become temporary if this issue is not handled carefully.