EXPONENTIATION

\ɛkspˌə͡ʊnɪnʃɪˈe͡ɪʃən], \ɛkspˌə‍ʊnɪnʃɪˈe‍ɪʃən], \ɛ_k_s_p_ˌəʊ_n_ɪ_n_ʃ_ɪ__ˈeɪ_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd