NONOBLIGATORY

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