SG Heritage Dictionary

Diapason [Noun] Webster's Dictionary 1828

1. In music, the octave or interval which includes all the tones.

2. Among musical instrument-makers, a rule or scale by which they adjust the pipes of organs, the holes of flutes, etc., in due proportion for expressing the several tones and semitones.

3. DIAPASON -diapente, a compound consonance in a triple ratio, as 3 to 9, consisting of 9 tones and a semitone, or 19 semitones; a twelfth.

4. DIAPASON -diatessaron, a compound concord, founded on the proportion of 8 to 3, consisting of eight tones and a semitone.

5. DIAPASON -ditone, a compound concord, whose terms are as 10 to 4, or 5 to 2.

6. DIAPASON -semiditone, a compound concord, whose terms are in the proportion of 12 to 5.

Diapason [Noun] Webster's Dictionary 1913

1. The octave, or interval which includes all the tones of the diatonic scale.

2. Concord, as of notes an octave apart; harmony.

3. The entire compass of tones.

4. A standard of pitch; a tuning fork; as, the French normal diapason.

5. 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.