All G&A a/c A/D a/r A/S a/s/l C/A See all meanings Idioms and phrases with a collision course idiom[ C/U ]   new music   plural A’s or As in Western audio, the sixth note in the scale (= series of notes) that starts to the Notice C, or perhaps a list of notes according to this Notice[four] The Roman variety ⟨a⟩ is located in most printed pr