• synonyms

F, f

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noun, plural F's or Fs, f's or fs.
  1. the sixth letter of the English alphabet, a consonant.
  2. any spoken sound represented by the letter F or f, as in fat, differ, or huff.
  3. something having the shape of an F.
  4. a written or printed representation of the letter F or f.
  5. a device, as a printer's type, for reproducing the letter F or f.
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  1. firm1.
  2. Photography. f-number.
  3. Music. forte2.
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  1. Symbol, Optics. focal length.
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  1. Fahrenheit.
  2. female.
  3. Genetics. filial.
  4. firm.
  5. franc; francs.
  6. French.
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  1. the sixth in order or in a series.
  2. (sometimes lowercase) (in some grading systems) a grade or mark that indicates academic work of the lowest quality; failure.
  3. Music.
    1. the fourth tone in the scale of C major or the sixth tone in the relative minor scale, A minor.
    2. a string, key, or pipe tuned to this tone.
    3. a written or printed note representing this tone.
    4. (in the fixed system of solmization) the fourth tone of the scale of C major, called fa.
    5. the tonality having F as the tonic note.
  4. (sometimes lowercase) the medieval Roman numeral for 40.Compare Roman numerals.
  5. Mathematics.
    1. field.
    2. function (of).
  6. (sometimes lowercase) Electricity. farad.
  7. Chemistry. fluorine.
  8. (sometimes lowercase) Physics.
    1. force.
    2. frequency.
    3. fermi.
  9. Biochemistry. phenylalanine.
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  1. (in designations of aircraft) fighter: F-105.
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  1. (in prescriptions) make.
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Origin of f.1

From the Latin word fac


  1. (in prescriptions) let them be made.
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Origin of f.2

From the Latin word fīant


  1. (in prescriptions) let it be made; let there be made.
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Origin of f.3

From the Latin word fiat


  1. (in the Netherlands) guilder; guilders.
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Origin of f.4

From the Dutch word florin




or f/, f:

  1. f-number.
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in f.

  1. in the end; finally.
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Origin of in f.

From the Latin word in fīne


  1. (Paul) Fe·lix (Ed·ler von Münz·berg) [poul fey-liks eyd-luhr fuh n mynts-berk] /paʊl ˈfeɪ lɪks ˈeɪd lər fən ˈmüntsˌbɛrk/, 1863–1942, Austrian composer, conductor, and writer.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for f



noun plural f's, F's or Fs
  1. the sixth letter and fourth consonant of the modern English alphabet
  2. a speech sound represented by this letter, usually a voiceless labio-dental fricative, as in fat
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symbol for
  1. music forte: an instruction to play loudly
  2. physics frequency
  3. (formerly in the Netherlands) guilder
  4. maths function (of)
  5. physics femto-
  6. chess See algebraic notation
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Word Origin

(sense 3) from Dutch: florin


f/ or f:

symbol for
  1. f-number
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symbol for
  1. music
    1. a note having a frequency of 349.23 hertz (F above middle C) or this value multiplied or divided by any power of 2; the fourth note of the scale of C major
    2. a key, string, or pipe producing this note
    3. the major or minor key having this note as its tonic
  2. Fahrenheit
  3. Fellow
  4. chem fluorine
  5. Helmholtz function
  6. physics force
  7. franc(s)
  8. farad(s)
  9. genetics a generation of filial offspring, F 1 being the first generation of offspring, F 2 being the second generation, etc
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abbreviation for
  1. France (international car registration)
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abbreviation for
  1. fighterF-106
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abbreviation for
  1. fathom(s)
  2. female
  3. grammar feminine
  4. plural ff. or FF. folio
  5. plural ff. following (page)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

f in Science


  1. Abbreviation of Fahrenheit
  2. The symbol for farad.
  3. The symbol for fluorine.
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  1. A pale-yellow, poisonous, gaseous element of the halogen group. It is highly corrosive and is used to separate certain isotopes of uranium and to make refrigerants and high-temperature plastics. It is also added in fluoride form to the water supply to prevent tooth decay. Atomic number 9; atomic weight 18.9984; melting point -223°C; boiling point -188.14°C; specific gravity of liquid 1.108 (at boiling point); valence 1. See Periodic Table.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.