Definition of F noun from the Oxford Advanced American Dictionary

     

    F

     noun
    noun
    NAmE//ɛf//
     
    [countable, uncountable](pl. Fs, F's
    NAmE//ɛfs//
     
    )
     
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  1. 1f (f's) the 6th letter of the English alphabet “Fox” begins with (an) F/“F.”
  2. 2(music) the fourth note in the scale of C major
  3. 3 the lowest grade that a student can get for a course, test, or piece of work, showing that it is very bad and the student has failed He got an F inChemistry.
See the Oxford Advanced Learner's Dictionary entry: F