Definition of the Italian term decimasettima in music:
seventeenth (interval of seventeen degrees, equal to two octaves plus a third)
seventeenth (the note a seventeenth above the tonic of a scale or the root of a chord)
organ flute mutation stop of 1⅗' pitch on the manuals (used with an 8' stop) and 3⅕' pitch on the pedals (used with a 16' stop), sounding a seventeenth (two octaves and a second) above the note played (equivalent to "Seventeenth" in English, "Terz" in German, "Tierce" in French, and "Tertia" in Latin)
