Definition of B noun from the Oxford Advanced American Dictionary

     

    B

     noun
    noun
    NAmE//bi//
     
    (pl. Bs, B's
    NAmE//biz//
     
    )
     
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  1. 1b (b's) [countable, uncountable] the second letter of the English alphabet “Butter” begins with (a) B/“B.”
  2. 2[countable, uncountable] (music) the 7th note in the scale of C major
  3. 3 [countable, uncountable] the second highest grade that a student can get for a class, test, or piece of work She got a B inHistory.
  4. 4[uncountable] used to represent the second of two or more possibilities Shall we go for plan A or plan B?
  5. 5[uncountable] used to represent a person, for example in an imagined situation, or to hide their identity Let's pretend A meets B in the park.
  6. Idioms
    from A to B
     
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    from one place to another For me a car is just a means of getting from A to B.
See the Oxford Advanced Learner's Dictionary entry: B