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For a crossword, it could be referring to the word in the across line if it gives a number; for example, 'opposite if 12 ac', you check 12 across is 'hard' then you use the number of boxes and any existing letters to see what word opposite of hard will fit, such as soft, easy or simple.

As a clue without the number, AC could mean the opposite of alternate current which is DC direct current. It could stand for air conditioner.

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9y ago

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