All G&A a/c A/D a/r A/S a/s/l C/A See all meanings Idioms and phrases over a collision class idiom[ C/U ]   new music   plural A’s or As in Western songs, the sixth note in the dimensions (= number of notes) that begins over the Notice C, or perhaps a list of notes determined by this Notice⟨a⟩ is definitely the third-most-commonly made use