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 class idiom[ C/U ]   songs   plural A’s or As in Western tunes, the sixth Notice in the size (= series of notes) that begins over the Observe C, or simply a set of notes based upon this Be aware?a? will be the 3rd-most-commonly applied letter in English immed