SEMICENTENNIAL

\sˌɛmɪsɛntˈɛnɪəl], \sˌɛmɪsɛntˈɛnɪəl], \s_ˌɛ_m_ɪ_s_ɛ_n_t_ˈɛ_n_ɪ__ə_l]\
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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.