Collins COBUILD Advanced Learner's English Dictionary - a a

(A’s, a’s) 1. A is the first letter of the English alphabet. N-VAR 2. In music, A is the sixth note in the scale of C major. N-VAR 3. If you get an A as a mark for a piece of work or in an exam, your work is extremely good. N-VAR 4. A or a is used as an abbreviation for words beginning with a, such as ‘acceleration’, ‘ampere’, or ‘answer’. 5. People talk about getting from A to B when they are referring generally to journeys they need to make, without saying where the journeys will take them. Cars are for getting people from A to B in maximum safety. PHRASE: PHR after v