UNIMPORTANCE

\ˌʌnɪmpˈɔːtəns], \ˌʌnɪmpˈɔːtəns], \ˌʌ_n_ɪ_m_p_ˈɔː_t_ə_n_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd