POLAR ZONE

\pˈə͡ʊlə zˈə͡ʊn], \pˈə‍ʊlə zˈə‍ʊn], \p_ˈəʊ_l_ə z_ˈəʊ_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd

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international pitch

  • the pitch used to tune instruments for concert performances; usually assigns 440 Hz A above middle C
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