All G&A a/c A/D a/r A/S a/s/l C/A See all meanings Idioms and phrases with a collision course idiom[ C/U ]   new music   plural A’s or As in Western tunes, the sixth note in the scale (= series of notes) that commences on the note C, or perhaps a list of notes determined by this Take note[4] The Roman kind ⟨a⟩ is found in most printed conte