1. [ noun ] (chemistry) a radioactive element of the actinide series; found in uranium ores
Synonyms: atomic_number_89 actinium
Related terms: chemical_element uranium_ore
2. [ noun ] (physics,electricity) an electric current that reverses direction sinusoidally
Synonyms: alternating_current

"In the US most household current is AC at 60 cycles per second"

Related terms: direct_current electricity
Similar spelling:   Acy