All G&A a/c A/D a/r A/S a/s/l C/A See all meanings Idioms and phrases on the collision study course idiom[ C/U ]   new music   plural A’s or As in Western new music, the sixth note in the scale (= series of notes) that starts on the Notice C, or a list of notes depending on this Take noteWhen the ancient Greeks adopted the alphabet, they had no