tertius

Definition of the Latin term tertius in music:

1. third (ordinal number)
2. third (interval of three degrees)
3. third (the note a third above the tonic of a scale or the root of a chord)
4. Terce, Third Hour (canonical hour)
5. 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 "Decima" in Italian)

Latin musical terms related to tertius: