Diapason
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Diapason may refer to:
- Diapason (interval), the name of the just octave in Pythagorean tuning
 - Diapason (pipe organ), a tonal grouping of the flue pipes of a pipe organ
 - Diapason (magazine), a French classical music magazine
 - A tuning fork
 - Diapason normal, the official French standard of concert pitch
 
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