RESEARCH EFFORT

\ɹɪsˈɜːt͡ʃ ˈɛfət], \ɹɪsˈɜːt‍ʃ ˈɛfət], \ɹ_ɪ_s_ˈɜː_tʃ ˈɛ_f_ə_t]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd