diapason

Definition of the French term diapason in music:

1. tuning fork
2. pitch
3. concert pitch (standard for the tuning of musical instruments, in which the note A above middle C typically has a frequency of 440 Hz; originally set by the French government in 1859 at 435 Hz)
4. the principal foundation stop of an organ, usually of 8' pitch on the manuals and 16' pitch on the pedals (equivalent to "Diapason" or "Principal" in English, "Prinzipal" in German, and "Montre" in French)
5. the range of a voice or instrument

French musical terms related to diapason: