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All G&A a/c A/D a/r A/S a/s/l C/A See all meanings Idioms and phrases on a collision system idiom[ C/U ]   new music   plural A’s or As in Western new music, the sixth note in the dimensions (= number of notes) that commences on the Observe C, or a list of notes based on this noteWhen the ancient Greeks adopted the alphabet, they'd no use for a