INVALIDATION

\ɪnvˌalɪdˈe͡ɪʃən], \ɪnvˌalɪdˈe‍ɪʃən], \ɪ_n_v_ˌa_l_ɪ_d_ˈeɪ_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.

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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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