IRRETRIEVABLY

\ɪɹɪtɹˈiːvəblɪ], \ɪɹɪtɹˈiːvəblɪ], \ɪ_ɹ_ɪ_t_ɹ_ˈiː_v_ə_b_l_ɪ]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1871 - The Cabinet Dictionary of the English Language