DIAMOND ANNIVERSARY

\dˈa͡ɪ͡əmənd ˌanɪvˈɜːsəɹˌi], \dˈa‍ɪ‍əmənd ˌanɪvˈɜːsəɹˌi], \d_ˈaɪə_m_ə_n_d ˌa_n_ɪ_v_ˈɜː_s_ə_ɹ_ˌi]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.