CONTEMPORANEOUSLY

\kəntˌɛmpɔːɹˈe͡ɪni͡əsli], \kəntˌɛmpɔːɹˈe‍ɪni‍əsli], \k_ə_n_t_ˌɛ_m_p_ɔː_ɹ_ˈeɪ_n_iə_s_l_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2010 - New Age Dictionary Database
By Oddity Software