Pronunciation: (kom'yu-tāt"), [key]
—v.t., -tat•ed, -tat•ing. Elect.
1. to reverse the direction of (a current or currents), as by a commutator.
2. to convert (alternating current) into direct current by use of a commutator.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.