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Definition of Middle c
1. Noun. The note designated by the first ledger line below the treble staff; 261.63 hertz.
Definition of Middle c
1. Noun. (music) A specific musical note, particularly the note C4, at approximately 261.6 hertz, appearing at the middle of the alto staff and directly between the treble and bass staves. ¹
2. Noun. (music) The key on a piano or other keyboard instrument corresponding to this note. ¹
¹ Source: wiktionary.com