f
abbreviation
firm.
f
2
American
F
3
American
[ef]
/ ɛf /
Or
f
noun
-
F's,
plural
-
Fs,
plural
-
f's,
plural
-
fs
plural
-
the sixth letter of the English alphabet, a consonant.
-
any spoken sound represented by the letter F or f, as in fat, differ, or huff.
-
something having the shape of an F .
-
a written or printed representation of the letter F or f.
-
a device, as a printer's type, for reproducing the letter F or f.
F
5
American
Symbol.
-
the sixth in order or in a series.
-
(sometimes lowercase) (in some grading systems) a grade or mark that indicates academic work of the lowest quality; failure.
-
Music.
-
the fourth tone in the scale of C major or the sixth tone in the relative minor scale, A minor.
-
a string, key, or pipe tuned to this tone.
-
a written or printed note representing this tone.
-
(in the fixed system of solmization) the fourth tone of the scale of C major, called fa.
-
the tonality having F as the tonic note.
-
-
(sometimes lowercase) the medieval Roman numeral for 40.
-
Mathematics.
-
(sometimes lowercase) farad.
-
Chemistry. fluorine.
-
(sometimes lowercase)
-
Biochemistry. phenylalanine.
f/
6
American
Or
f/
or
f:
abbreviation
Photography.
F-
7
American
abbreviation
Military.
f.
8
American
abbreviation
f.
9
American
abbreviation
f.
10
American
abbreviation
f.
11
American
abbreviation
f.
12
American
abbreviation
-
farad.
-
farthing.
-
father.
-
fathom.
-
feet.
-
female.
-
feminine.
-
filly.
-
fine.
-
fluid (ounce).
-
folio.
-
following.
-
foot.
-
form.
-
formed of.
-
franc.
-
from.
-
Mathematics. function (of ).
F.
13
American
abbreviation
-
Fahrenheit.
-
February.
-
Fellow.
-
forint.
-
franc; francs.
-
France.
-
French.
-
Friday.
F
1
British
symbol
-
music
-
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
-
a key, string, or pipe producing this note
-
the major or minor key having this note as its tonic
-
-
Fahrenheit
-
Fellow
-
chem fluorine
-
Helmholtz function
-
physics force
-
franc(s)
-
farad(s)
-
genetics a generation of filial offspring, F 1 being the first generation of offspring, F 2 being the second generation, etc
abbreviation
f
2
British
symbol
-
music forte: an instruction to play loudly
-
physics frequency
-
(formerly in the Netherlands) guilder
-
maths function (of)
-
physics femto-
-
chess See algebraic notation
f.
3
British
abbreviation
-
fathom(s)
-
female
-
grammar feminine
-
folio
-
following (page)
f
4
British
/ ɛf /
noun
-
the sixth letter and fourth consonant of the modern English alphabet
-
a speech sound represented by this letter, usually a voiceless labio-dental fricative, as in fat
F-
5
British
abbreviation
f
6
British
symbol
Other Word Forms
Noun Inflected Forms
Etymology
Origin of f.8
From the Latin word fac
Origin of f.9
From the Latin word f īant
Origin of f.10
From the Latin word fiat
Origin of f.11
From the Dutch word florin
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
In Walter’s case, the related-party loans f initially were reported at between $1 billion and $1.4 billion when the true total actually was between $16 billion and $21 billion.
From Los Angeles Times ● Sep. 5, 2026
The most recent game in the franchise, a spin-off called Silent Hill f, sold a million copies the day it was released in September 2025.
From BBC ● Feb. 16, 2026
The cybersecurity company’s earnings and revenue forecast met analysts’ expectations but f ailed to impress investors.
From Barron's ● Nov. 20, 2025
In Welsh a single f is pronounced as a v — it takes two fs to make the noise in “fight” — and the emphasis is always on the penultimate syllable.
From Salon ● May 27, 2024
Only he does that thing where he pronounces tr like an f.
From "Free Lunch" by Rex Ogle
Average grades in preparatory math, precalculus and calculus across UC continue their five-year decline, while D and F grades, no-pass marks and withdrawals in those courses have gone up.
From Los Angeles Times ● Sep. 17, 2026
For a time, Trump also had his name placed on the walls of the Kennedy Center, the culture and arts institute named after assassinated president John F Kennedy.
From Barron's ● Sep. 3, 2026
The executive order came after Health Secretary Robert F Kennedy Jr took a number of steps to remake US vaccine policies over the past year, including the childhood vaccination schedule.
From BBC ● Aug. 25, 2026
A delicious word salad: How many words can you create with the letters Y, B, O, F, U, and N?
From Slate ● Aug. 18, 2026
The alphabet was divided into five rows of five letters each—A through E in the first row, F through J in the second row, and so on.
From "Most Dangerous: Daniel Ellsberg and the Secret History of the Vietnam War" by Steve Sheinkin
Some of the most intriguing targets include the TRAPPIST-1 system planets d, e, f, and g, located about 40 light-years from Earth, as well as LHS 1140 b, which lies 48 light-years away.
From Science Daily ● Mar. 25, 2026
The cybersecurity company’s earnings and revenue forecast met analysts’ expectations but f ailed to impress investors.
From Barron's ● Nov. 20, 2025
Thompson has instituted a curfew around the facility, allowing protests to occur only between f 9 a.m. and 6 p.m.
From Los Angeles Times ● Oct. 10, 2025
In Welsh a single f is pronounced as a v — it takes two fs to make the noise in “fight” — and the emphasis is always on the penultimate syllable.
From Salon ● May 27, 2024
Now, me f I've got no use for lame excuses or imitation love that packs a punch.
From "Bronx Masquerade" by Nikki Grimes
The Cincinnati Bengals ranked 27th and had an F- grade for their nutritional offerings.
From Washington Post ● Mar. 1, 2023
"If I could go lower than F- I would," John, a Floridian visiting the Golden State, told Fox News.
From Fox News ● Aug. 21, 2021
Freekick just outside the D. And the resultant freekick is an F-, as Oscar dabs the ball into the wall.
From The Guardian ● Sep. 16, 2015
Simply by changing the Ph- to an F-, the country star showed just how easily team names could be switched from masculine to feminine.
From Salon ● Mar. 29, 2014
The time in the F- 86, everything had gone well.
From "Flying to the Moon: An Astronaut's Story" by Michael Collins
“Syzygy or, the Ceasing of the Sun” by juliany f. taveras is a rumination on what the future might be like.
From New York Times ● Sep. 23, 2021
Adults of C. f. pastinator resemble the juvenile condition typical of C. f. frugilegus.
From Scientific American ● May 12, 2013
The price of a complete mammoth is $30,000 f. o. b.
From Time Magazine Archive
In 1924 he profited $25,000,000 by shipping parts to district assembling plants, putting them together there and then charging the f. o. b. selling price.
From Time Magazine Archive
It is quite obvious, that when high-frequency currents are made use of, ground connections are—at least when the e. m. f. of the currents is great—better than a return wire.
From The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting by Thomas Commerford Martin
Said Marina F. Bellini, president, MGS & Digital Technologies, Mars, “we cannot think about the human side and the tech side separately.”
From The Wall Street Journal ● Sep. 16, 2026
Robert F. Kennedy described lowered testosterone in young men as a “existential problem.”
From Slate ● Sep. 13, 2026
Secretary of Health and Human Services Robert F. Kennedy Jr. a letter asking him to account for how the federal response had gone so badly.
From Salon ● Sep. 13, 2026
"Our findings show that gut bacteria are also more dynamic than previously thought. Well-adapted strains can spread internationally and occupy new ecological niches," says study leader Martin F. Polz from the University of Vienna.
From Science Daily ● Sep. 7, 2026
Only five weeks later, Captain Robert F. Scott of England reached it, a heartbreaking second-place finish—and then died on the way back to his base.
From "Shipwreck at the Bottom of the World" by Jennifer Armstrong
In general, we have a school district focused on 100% graduation rates, no F’s.
From Los Angeles Times ● Jul. 1, 2026
“We have seen Louisiana students go from all F’s to straight A’s because of this program,” Landry said in a written statement to the Journal.
From The Wall Street Journal ● Apr. 23, 2026
The four F's represent the categories of things they’ve identified as those people value most: family, friends, faith and fulfilling work.
From Salon ● May 24, 2025
A date for Soldier F's trial will be decided early in the New Year.
From BBC ● Dec. 6, 2024
You couldn’t be tongue-tied nor catch a case of lockjaw, or Tansy would give you an F. She was quick with her F’s.
From "The Teacher’s Funeral" by Richard Peck
Previously an A and B student, Bell started getting Fs at Alemany that spring, according to court filings.
From The Wall Street Journal ● Dec. 5, 2025
“I have straight Fs now — I sleep just fine at night.”
From Los Angeles Times ● Aug. 6, 2024
This exercise is the opposite of a zero Fs situation, though – she very much cares about the final glimpse the public has of Wendy Williams.
From Salon ● Feb. 23, 2024
When results day came around, Luke got his results - four Fs and an E.
From BBC ● Aug. 17, 2023
Since the “Toast for Change” wiped the slate clean for many of them, their grades have gone from Ds and Fs to As and Bs.
From "The Freedom Writers Diary" by The Freedom Writers
The Georgia native painted himself so much as one of Philly’s own, that it’s amazing Collins didn’t confess he was named with two f’s in honor of the Temple Tuff motto.
From Washington Times ● Dec. 14, 2016
Royal looked up and said, ‘I’ve been sitting here for 30 minutes, trying to figure out if professor has one or two f’s in it.’
From New York Times ● Nov. 7, 2012
"The only name I like is Jeff if you spell it with two f's instead of t's," she said.
From Time Magazine Archive
Gibbous nose aloft and in fine priggish voice, Master Freddie imparts phonetic reality to an age when Britishers wrote s's that looked like f's.
From Time Magazine Archive
All the f’s are fractions, having values between 0 and 1; they will pare down the large value of N.. To derive N we must estimate each of these quantities.
From "Cosmos" by Carl Sagan
To follow the transformation, the researchers used time-resolved reflectance spectroscopy and ultrashort laser pulses lasting only six fs.
From Science Daily ● Aug. 21, 2026
In Welsh a single f is pronounced as a v — it takes two fs to make the noise in “fight” — and the emphasis is always on the penultimate syllable.
From Salon ● May 27, 2024
Emotional truth is sacrificed at the altar of manufactured laffs, with two fs.
From Los Angeles Times ● Mar. 17, 2022
The time resolution of the setup after dispersion correction is ≤150 fs.
From Nature ● Mar. 28, 2017
Longitudinal section of flower; v, bracteole on the peduncle; l, sepals; ls, appendage of sepal; c, petals; cs, spur of the lower petals; fs, glandular appendage of the lower stamens; a, anthers.
From Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5 "Fleury, Claude" to "Foraker" by Various
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
