applied before some uncountable nouns when you need to limit their indicating in a way, like when describing them additional totally or referring to one example of them:[ C/U ]   tunes   plural A’s or As in Western audio, the sixth Notice in the dimensions (= number of notes) that begins on the Notice C, or even a list of notes based upon this

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 study course idiomAbout 1000 bce, in Byblos and various Phoenician and Canaanite centres, the indicator was supplied a linear form (three), the supply of all later varieties. In Semitic languages this sign was referred to as aleph[4] The Roman form ⟨a⟩ is loc