Topic: LETTERS AND PUNCTUATION
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F , f
plural F's, f's
plural F's, f's1SLA [uncountable and countable] the sixth letter of the English alphabet
2 [uncountable and countable] the fourth note in the musical scale1 (8) of C major or the musical key based on this note
3 [countable] a mark given to a student's work to show that it is not good enough :
I got an F in chemistry.
I got an F in chemistry.