AC Definition

1. alternating current. Compare DC and AC/DC.
2. ante Christum (Latin), before Christ.
3. Appellation contrôlée.

1. chem.
Actinium.

1. An electric current that reverses its direction of flow with a constant frequency, and is therefore continuously varying. Compare direct current.

1. The system which within France designates and controls the names especially of wine, but also of cognac, armagnac, calvados and some foods, guaranteeing the authenticity of the producing region and the methods of production, and which outside France protects the generic names from misappropriation.
2. The highest designation of French wine awarded under this system. Compare VDQS, vin de pays.