• (letter name) IPA: /ɛf/
  • (phoneme) IPA: /f/
  1. Letter of the English alphabet


  1. (printing, abbreviation) Folio, paper and book size (10"-12.5" x 15"-20")
  2. (euphemistic) fuck
    What the f do you think you're doing?
  3. Alternative form of f.
  • (folio paper and book size) F, fo
  • Russian: ж
  1. Alternative letter-case form of F#English|F

Pronunciation Letter
  1. Letter of the English alphabet
    • 1945 August 17, George Orwell [pseudonym; Eric Arthur Blair], chapter 3, in Animal Farm: A Fairy Story, London: Secker & Warburg, OCLC 3655473 ↗:
      On several occasions, indeed, he did learn E, F, G, H, but by the time he knew them, it was always discovered that he had forgotten A, B, C, and D.

f (not comparable)

  1. Abbreviation of false#English|false.
  2. Abbreviation of female#English|female.
  3. (philately) Abbreviation of fine#English|fine.

f (plural fs)

  1. An academic grade, specifically —
    1. A failing grade, with the next best grade being either a D or an E (some institutions issue Es instead of Fs).
    2. (UK) A grade lower than E but higher than G.
  2. A grade of black-lead pencil (originally an abbreviation of fine).
  3. In the American Library Association, a folio-sized book, over 30 cm in height.
  4. Abbreviation of fellow#English|fellow, as in F.G.S. or F.R.S.
  5. (nautical) Abbreviation of fog#English|fog, as in a ship's log.
  6. (US, meteorology) Initialism of Fujita (followed by a number when used in a rating on the Fujita scale and indicating the intensity of a tornado).
    the F-scale ; an F3 tornado
  7. Initialism of function#English|function (followed by a number when used on or referencing a function key of a computer keyboard).
    Press F1 for help.
Proper noun
  1. Abbreviation of various proper names.
  2. Abbreviation of Fahrenheit#English|Fahrenheit.
  3. Abbreviation of Father#English|Father, as a title given to priests.
    Synonyms: Fr
  4. Abbreviation of French#English|French.
  5. Abbreviation of Friday#English|Friday.
    Synonyms: Fri


  1. (euphemistic) Initialism of fuck#English|fuck.
  1. (internet slang) Used to profess respect for a deceased person, or for something that has been lost.
  2. (internet slang) Used to express regret or disappointment about an unfortunate event or piece of information.

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