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1. An electric current that reverses direction sinusoidally
   "In the US most household current is AC at 60 cycles per second";
   - alternating current, alternating electric current

1. A radioactive element of the actinide series; found in uranium ores
   - actinium, atomic number 89

Type of: chemical element, electrical energy, electricity, element

Part of: uranium ore

Encyclopedia: AC, NJ