USEFULNESS

\jˈuːsfə͡lnəs], \jˈuːsfə‍lnəs], \j_ˈuː_s_f_əl_n_ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1871 - The Cabinet Dictionary of the English Language

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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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