- F's, f's1) N-VAR F is the sixth letter of the English alphabet.2) N-VAR In music, F is the fourth note in the scale of C major.3) f. is an abbreviation for `following'. It is written after a page or line number to indicate that you are referring to both the page or line mentioned and the one after it. You use ff. when you are referring to the page or line mentioned and two or more pages or lines after it.4) F or f is a written abbreviation for words beginning with f, such as `female', `feminine', `franc', `false', and `Fahrenheit'.
Heat the oven to 400 degrees F.5) In a piece of music, f is a written abbreviation for forte and indicates that the piece should be played loudly.
English dictionary. 2008.