Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun ac

2 senses of ac

Sense 1
actinium, Ac, atomic number 89 -- (a radioactive element of the actinide series; found in uranium ores)
       => chemical element, element -- (any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter)

Sense 2
alternating current, AC, alternating electric current -- (an electric current that reverses direction sinusoidally; "In the US most household current is AC at 60 cycles per second")
       => electricity, electrical energy -- (energy made available by the flow of electric charge through a conductor; "they built a car that runs on electricity")