World English Dictionary
diapason (ˌdaɪəˈpeɪzən, -ˈpeɪsən)
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()
 b.  a tuning fork or pitch pipe
4.  (in classical Greece) an octave
[C14: from Latin: the whole octave, from Greek: () dia pasōn (khordōn sumphōnia) (concord) through all (the notes), from dia through + pas all]

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