Definition of D noun from the Oxford Advanced American Dictionary

     

    D

     noun
    noun
    NAmE//di//
     
    [countable, uncountable](pl. Ds, D's
    NAmE//diz//
     
    )
     
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  1. 1 d (d's) the fourth letter of the English alphabet “Dog” begins with (a) D/“D.”
  2. 2(music) the second note in the scale of C major
  3. 3 the fourth highest grade that a student can get for a course, test, or piece of work, showing that it is not very good He got a D in geography. see also D-Day
See the Oxford Advanced Learner's Dictionary entry: D