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 course idiom[ C/U ]   new music   plural A’s or As in Western music, the sixth Notice in the scale (= number of notes) that begins on the Take note C, or perhaps a set of notes based upon this Be awareWhen the ancient Greeks adopted the alphabet, that they ha