OBSERVER

\ɒbzˈɜːvə], \ɒbzˈɜːvə], \ɒ_b_z_ˈɜː_v_ə]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
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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