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\dˈə͡ʊntnˈə͡ʊ], \dˈə‍ʊntnˈə‍ʊ], \d_ˈəʊ_n_t_n_ˈəʊ]\
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2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2006 - WordNet 3.0
By Princeton University