Noun
(music) The major key with the notes F, G, A, B♭, C, D, E, the key signature of which has one flat.
(music) The major chord with a root of F.
Source: en.wiktionary.orgFor example, while fretting a sustained "F" (on the third fret of the "D" string), underneath an F major chord being played by a piano player, a bassist might hold down the "C" and low "F" below this note so their harmonics sound sympathetically. Source: Internet
Beginning with Mozart and Clementi, there began a creeping colonization of the subdominant region (the ii or IV chord, which in the key of C major would be the keys of d minor or F major). Source: Internet
Thus F major (D minor) has one flat which is on the B; then B major (G minor) has two flats (on B and E) and so on. Source: Internet
The major scale with one flat is F major. Source: Internet
The "Träumerei" in F major, No. 7 of the set, is one of the most famous piano pieces ever written, which has been performed in myriad forms and transcriptions. Source: Internet