The fourth note of the diatonic scale of C major, called fa in solfège.
(letter, uppercase) The sixth letter of the English alphabet, called ef and written in the Latin script.
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. 1943 November – 1944 February (date written; published 1945 August 17), George Orwell [pseudonym; Eric Arthur Blair], Animal Farm […], London: Secker & Warburg, published May 1962, →OCLC:
The scale or key which has that note for its tonic.
On a piano keyboard, the white key next to the left of each group of three black keys (see figure).
The degree of a staff assigned to such a key or tone; a note on such a degree.
So last summer, when the Massachusetts State Legislature became one of the first in the nation to consider a bill to add an “X” option for nonbinary genders to the “M” and “F” on the state driver’s license, El, 17, was less surprised than some at the maneuver that effectively killed it. 2019 May 29, Amy Harmon, “Which Box Do You Check? Some States Are Offering a Nonbinary Option”, in The New York Times, archived from the original on 08 Jun 2019:
(abbreviation, alt-of, not-comparable) Abbreviation of fine.
(US, abbreviation, alt-of, initialism) Initialism of Fujita (followed by a number when used in a rating on the Fujita scale and indicating the intensity of a tornado).
The lieutenant consulted the patrol reports. “I quote: ‘MFer done throwed the nigger in the MFing truck, turned that MFing gun on the whole MFing street one more time, and then peeled that MFer the F out of there.’ Unquote. You interpret that as you will.” 2005, P. T. Deutermann, The Cat Dancers, New York, N.Y.: St. Martin's Press, →ISBN, page 57:
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F en · PROPN · etymology 2
Etymology
Abbreviation.
Meanings
(abbreviation, alt-of) Abbreviation of various proper names.
"Oh, F you." 2011, Don Pendleton, Assassin's Code, page 139:
Oh F this for a laugh, ya get the yoke I'm sure now, ya doesn't has to explain. 2017, Richard Segal, Sunday Night at the Races:
I'll be in tears on every second assignment; they're just like, "Oh f', this guy really cares." 2012, Michelle Bogre, Photography as Activism: Images for Social Change: