Definition of "F"

The sixth letter of the English alphabet, called ef and written in the Latin script.  quotations  examples

The ordinal number sixth, derived from this letter of the English alphabet, called ef and written in the Latin script.  examples

(music)

1. The fourth note of the diatonic scale of C major, called fa in solfège.  examples

2. The scale or key which has that note for its tonic.  examples

3. On a piano keyboard, the white key next to the left of each group of three black keys (see figure).  examples

4. The degree of a staff assigned to such a key or tone; a note on such a degree.  examples

(stock ticker symbol) Ford Motor Company  examples

Abbreviation of false.  examples

Abbreviation of female.  examples

(philately) Abbreviation of fine.  examples

(numismatic slang) Abbreviation of fine.

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).  examples

2. (UK) A grade lower than E but higher than G.  examples

A grade of black-lead pencil (originally an abbreviation of fine).  examples

In the American Library Association, a folio-sized book, over 30 cm in height.  examples

Abbreviation of fellow.  examples

(nautical) Abbreviation of fog, as in a ship's log.  examples

(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).

Initialism of function (followed by a number when used on or referencing a function key of a computer keyboard).  examples

(bacteriology) Abbreviation of fertility factor.

Abbreviation of various proper names.  examples

Abbreviation of Fahrenheit.  examples

Abbreviation of Father, as a title given to priests.  examples

Abbreviation of French.  examples

Abbreviation of Friday.  examples

(euphemistic) Initialism of fuck.  examples

(Internet slang, Twitch) Used to indicate regret for an unfortunate event.  quotations