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 ]   audio   plural A’s or As in Western audio, the sixth Notice in the size (= series of notes) that begins on the Take note C, or simply a list of notes depending on this Be awareA is usually utilized to denote a thing or an individua