EXTEMPORANEOUSNESS

\ɛkstˌɛmpɔːɹˈe͡ɪni͡əsnəs], \ɛkstˌɛmpɔːɹˈe‍ɪni‍əsnəs], \ɛ_k_s_t_ˌɛ_m_p_ɔː_ɹ_ˈeɪ_n_iə_s_n_ə_s]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.