SIXTY-ONE

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