- 1f (f's) the 6th letter of the English alphabet “Fox” begins with (an) F/“F.”
- 2(music) the fourth note in the scale of C major
- 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.
NAmE//ɛf//[countable, uncountable](pl. Fs, F's