EMPIRE DAY

\ˈɛmpa͡ɪ͡ə dˈe͡ɪ], \ˈɛmpa‍ɪ‍ə dˈe‍ɪ], \ˈɛ_m_p_aɪə d_ˈeɪ]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd