A

Universal Words noun, symbol, abbreviation noun (also a) (plural A's, a's ) 1 [C,U] the first letter of the English alphabet: 'Apple' begins with (an) A / 'A'. 2 (A) [C,U] (music) the 6th note in the scale of C MAJOR 3 [C,U] the highest mark/grade that a student can get for a piece of work or course of study: She got (an) A in / for Biology. * He had straight A's (= nothing but A's) all through high school. 4 (A) [U] used to represent the first of two or more possibilities: Shall we go for plan A or plan B? 5 (A) [U] used to represent a person, for example in an imagined situation or to hide their identity: Let's assume A knows B is guilty. seealsoA-FRAME, ALEVEL, A-ROAD IDIOMS from A to B from one place to another: I don't care what a car looks like as long as it gets me from A to B. from A to Z including everything there is to know about sth: By the end of the week we knew the subject from A to Z. symbol 1 used in Britain before a number to refer to a particular important road: the A34 to Newbury 2 used (but not in the US) before numbers which show standard metric sizes of paper: a sheet of A4 paper (= 297ﾗ210mm) abbreviation (in writing) AMP(S)