SEPTEMBER 29

\sɛptˈɛmbə twˈɛntinˈa͡ɪn], \sɛptˈɛmbə twˈɛntinˈa‍ɪn], \s_ɛ_p_t_ˈɛ_m_b_ə t_w_ˈɛ_n_t_i_n_ˈaɪ_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd