D defs.my
Entry 1 sense Webster, 1913

Alternating current

· Al·ter·nat·ing cur·rent · IPA
01 A current which periodically changes or reverses its direction of flow, especially an electric current that reverses direction sinusoidally…
  1. 1.
    A current which periodically changes or reverses its direction of flow, especially an electric current that reverses direction sinusoidally, as is used for most domestic and industrial power requirements. Contrasted with direct curent.(Elec.)
Syn. AC