f

I. noun (plural f's or fs) Usage: often capitalized, often attributive Date: before 12th century 1. a. the 6th letter of the English alphabet b. a graphic representation of this letter c. a speech counterpart of orthographic f 2. the fourth tone of a C-major scale 3. a graphic device for reproducing the letter f 4. one designated f especially as the sixth in order or class 5. a. a grade rating a student's work as failing b. one graded or rated with an F 6. something shaped like the letter F II. abbreviation 1. failure 2. false 3. family 4. faraday 5. feast 6. female 7. feminine 8. femto- 9. fermi 10. fine 11. finish 12. fluid; fluidness 13. focal length 14. folio 15. [following] and the following one 16. force 17. forte 18. fragile 19. frequency 20. from 21. full