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 program idiom[ C/U ]   new music   plural A’s or As in Western tunes, the sixth Observe in the size (= series of notes) that begins on the Take note C, or maybe a list of notes depending on this Observe[four] The Roman form ?a? is found in most printed conten