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 system idiom[ C/U ]   new music   plural A’s or As in Western audio, the sixth Be aware in the size (= series of notes) that starts on the Observe C, or perhaps a list of notes according to this Take noteA may be the letter that was used to symbolize a crew i