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\dɪfˈɒlt ˈɒpʃən], \dɪfˈɒlt ˈɒpʃən], \d_ɪ_f_ˈɒ_l_t ˈɒ_p_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd