Mus. (a) The consonant interval of the octave, corresponding to the mathematic proportion of 2 to 1 in number of vibrations; double (twies) diapasoun, the interval of two octaves, corresponding to the……

Mus. (a) The consonant interval of a fifth, corresponding to the mathematical proportion of 3 to 2 in number of vibrations; (b) a tone which sounds the interval of a fifth above another tone. …

Mus. (a) The consonant interval of a fourth, corresponding to the mathematical proportion of 4 to 3 in number of vibrations; (b) a tone which sounds the interval of a fourth above another tone. …

(a) Mus. The entire range of tones in the hexachordal system of Guido d'Arezzo; ?also, the lowest tone in the scale; (b) a song; a lament. …