EXTEMPORANEAN

\ɛkstˌɛmpɔːɹˈe͡ɪni͡ən], \ɛkstˌɛmpɔːɹˈe‍ɪni‍ən], \ɛ_k_s_t_ˌɛ_m_p_ɔː_ɹ_ˈeɪ_n_iə_n]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald