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international pitch

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noun Music.
  1. diapason normal pitch.

Origin of international pitch

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for international pitch

international pitch

noun
  1. music the frequency of 435 hertz assigned to the A above middle C, widely used until 1939See pitch 1 (def. 30)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012