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 system idiom[ C/U ]   audio   plural A’s or As in Western audio, the sixth Be aware in the dimensions (= series of notes) that begins to the Be aware C, or a set of notes based upon this Take note?a? will be the 3rd-most-normally applied letter in English imm… Read More