MEGALOMANIACAL

\mˈɛɡəlˌɒmɐnˌa͡ɪ͡əkə͡l], \mˈɛɡəlˌɒmɐnˌa‍ɪ‍əkə‍l], \m_ˈɛ_ɡ_ə_l_ˌɒ_m_ɐ_n_ˌaɪə_k_əl]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd