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1. A full, rich outpouring of harmonious sound.
2. The entire range of an instrument or voice.
3. Either of the two principal stops on a pipe organ that form the tonal basis for the entire scale of the instrument.
4. The interval and the consonance of an octave.
5. A standard indication of pitch.
6. A tuning fork.
[Middle English diapasoun, from Latin diapāsōn, the whole octave, from Greek dia pāsōn (khordōn), through all (the notes) : dia, through; see dia- + pāsōn, feminine genitive pl. of pās, every; see pant- in the Appendix of Indo-European roots.]
1. (Instruments) either of two stops (open and stopped diapason) usually found throughout the compass of a pipe organ that give it its characteristic tone colour
2. (Instruments) the compass of an instrument or voice
3. (Music, other) (chiefly in French usage)
a. a standard pitch used for tuning, esp the now largely obsolete one of A above middle C = 435 hertz, known as diapason normal (French(djapazɔ̃ nɔrmal)
b. a tuning fork or pitch pipe
4. (Music, other) (in classical Greece) an octave
[C14: from Latin: the whole octave, from Greek: (hē) dia pasōn (khordōn sumphōnia) (concord) through all (the notes), from dia through + pas all]
diaˈpasonal, diapasonic adj
di•a•pa•son(ˌdaɪ əˈpeɪ zən, -sən)
1. a full, rich outpouring of melodious sound.
2. the compass of a voice or instrument.
3. a fixed standard of pitch.
4. a principal stop of a pipe organ extending through the range of the instrument.
5. tuning fork.
[1350–1400; Middle English diapasoun < Latin diapāsōn the whole octave < Greek dià pāsôn (chordôn) through all (the notes), short for hē dià pāsôn chordôn symphōnía the concord through all the notes of the scale]