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 ]   tunes   plural A’s or As in Western music, the sixth Notice in the dimensions (= series of notes) that commences to the Notice C, or even a set of notes dependant on this ObserveWhen the ancient Greeks adopted the alphabet, they'd no use