Definition of E noun from the Oxford Advanced American Dictionary

     

    E

     noun
    noun
    NAmE//i//
     
    [countable, uncountable](pl. Es, E's
    NAmE//iz//
     
    )
     
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  1. 1 e (e's) the fifth letter of the English alphabet “Egg” begins with (an) E/“E.”
  2. 2 (music) the third note in the scale of C major
See the Oxford Advanced Learner's Dictionary entry: E