Definitions for "Diapason"
The octave, or interval which includes all the tones of the diatonic scale. Compare disdiapason.
Concord, as of notes an octave apart; harmony.
The entire compass of tones; the entire compass of tones of a voice or an instrument.
One of certain stops in the organ, so called because they extend through the scale of the instrument. They are of several kinds, as open diapason, stopped diapason, double diapason, and the like.
either of the two main stops on a pipe organ
an organ stop