I. F 1 BrE AmE , f /ef/ ( plural F’s , f’s ) noun
1 . [uncountable and countable] the sixth letter of the English alphabet
2 . [uncountable and countable] the fourth note in the musical ↑ scale 1 (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.
⇨ ↑ f-word
II. F 2 BrE AmE
1 . the written abbreviation of Fahrenheit :
Water boils at 212° F.
2 . the written abbreviation of female
3 . the written abbreviation of false