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 ]   audio   plural A’s or As in Western music, the sixth Be aware in the dimensions (= series of notes) that starts about the note C, or even a list of notes according to this Be aware[4] The Roman type ?a? is located in most printed content