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alternating current has 2 distinct synonyms spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is direct current.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an electric current that reverses direction sinusoidally
“In the US most household current is AC at 60 cycles per second”
Synonyms, antonyms and the broader and narrower relations for alternating current come from Princeton University’s WordNet. Full sources and licences.