EXTEMPORISATION

\ɛkstˌɛmpɔːɹa͡ɪzˈe͡ɪʃən], \ɛkstˌɛmpɔːɹa‍ɪzˈe‍ɪʃən], \ɛ_k_s_t_ˌɛ_m_p_ɔː_ɹ_aɪ_z_ˈeɪ_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd