DIPLOMATIAL

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