Definition of M abbreviation from the Oxford Advanced Learner's Dictionary



    BrE BrE//em//
    ; NAmE NAmE//em//
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  1. 1(also med.) (especially for sizes of clothes) medium S, M and L (= small, medium and large)
  2. 2(used with a number to show the name of a British motorway ) heavy traffic on the M25
See the Oxford Advanced American Dictionary entry: M