diapason definition, diapason meaning | English dictionary

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      n     (Music)  
1    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    the compass of an instrument or voice  
3      (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    (in classical Greece) an octave  
     (C14: from Latin: the whole octave, from Greek: (he) dia pason (khordon sumphonia) (concord) through all (the notes), from dia through + pas all)  
  diapasonal, diapasonic      adj  
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