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f

F means the sixth letter of the English alphabet, the Fahrenheit temperature scale, a grade for failing work, or the fourth note in the C musical scale. (noun)

An example of f is the first letter in the word "foot."
An example of f is 96 degrees F.
An example of f is a grade a student who got 7 out of 10 questions wrong would receive.
An example of f is the musical note on the C-scale after e.

F means relating to, of or shaped like the sixth letter of the English alphabet. (adjective)

An example of f used as an adjective is in the phrase "f grade," which means a grade of f.

See f in Webster's New World College Dictionary

or F

noun pl. f's, F's

the sixth letter of the English alphabet: a modification of the Old Greek digamma (), ultimately from the Phoenician
any of the speech sounds that this letter represents, as, in English, the (f) of fire
a type or impression for f or F
the sixth in a sequence or group
an object shaped like

adjective

of f or F
sixth in a sequence or group
shaped like

femto-
Physics frequency
furlong(s)

Musical Direction loud(ly)

noun

Educ.
1. a grade indicating failing work
2. sometimes, a grade indicating fair or average work
Music
1. the fourth tone or note in the ascending scale of C major
2. the scale having this tone as a keynote
3. a note representing this tone
4. a key, string, etc. producing this tone

Fahrenheit
farad(s)
faraday(s)
Father
February
Fellow (of a learned society)
female or feminine
Genetics filial generation
fine
Insurance fire
Photog. f-number
folio(s)
following
Physics force
franc(s)
French
Friar
Friday
Math. function
Pharmacy
1. let there be made
2. make

Also, for F, , -, , & , f

fluorine

or f/ or F:

Photog. f-number

See f in American Heritage Dictionary 4

or F (ĕf)

noun pl. f's f's or F's also fs or Fs

The sixth letter of the modern English alphabet.
Any of the speech sounds represented by the letter f.
The sixth in a series.
Something shaped like the letter F.
F A grade that indicates failing status.
Music
a. The fourth tone in the scale of C major or the sixth tone in the relative minor scale.
b. A key or scale in which F is the tonic.
c. A written or printed note representing this tone.
d. A string, key, or pipe tuned to the pitch of this tone.