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 study course idiom[ C/U ]   audio   plural A’s or As in Western audio, the sixth Notice in the scale (= number of notes) that commences on the Be aware C, or even a list of notes determined by this Observe?a? is definitely the 3rd-most-typically employed lett