commutate

Meanings

1. To reverse the direction of (a current).
2. To convert from being or using an alternating current into being or using a direct current.
3. To commute; to be invariant under a reversal of the positions of operands.
4. To commute; to change one kind of payment into another, especially to convert from several installments to a single lumpsum payment.
5. To remove or reduce the legal obligations or restrictions on
6. To transform, especially into a reversed or opposite form.

Etymology

Back-formation from commutation (in the late 19th century), as is commutator (noun) too.