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 ]   songs   plural A’s or As in Western music, the sixth note in the scale (= number of notes) that commences over the Notice C, or simply a set of notes based on this Notice⟨a⟩ may be the 3rd-most-commonly applied letter in English afte