Определение middle c в Английский Язык Английский Язык словарь
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
The tone represented by a note on the first ledger line below a treble clef or the first ledger line above a bass clef. It is the first C below international pitch. the musical note C, which is the middle note on a piano