AC may refer to any of the following, broken down by subject area. Science · Actinium (Ac), a chemical element · Acetaldehyde (also Ac), an organic ion · Acetate (also Ac), an organic ion · Alternating current, a type of electric current · AC power, a net transfer of energy over a complete cycle of the alternating current waveform · Anterior commissure, a small bundle of nerve fibres that connect the right and left temporal lobes · Anticipated convection, the code for severe thunderstorm forecasts issued daily for the contiguous U.S. by the Storm Prediction Center · Armored Cable, a type of power cable used by electricians · attocoulomb (aC), an SI unit of electric charge · Accessory cells, used in cell cultures · Axiom of choice, a mathematical set theory concept · Acromioclavicular joint in humans and