Definition of A symbol from the Oxford Advanced Learner's Dictionary



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  1. 1used in Britain before a number to refer to a particular important road the A34 to Newbury
  2. 2used (but not in the US) before numbers which show standard metric sizes of paper a sheet of A4 paper (= 297×210mm) A3 (= 420×297mm) A5 (= 210×148mm)
See the Oxford Advanced American Dictionary entry: A