COINCIDENTALLY

\kə͡ʊˌɪnsɪdˈɛntə͡li], \kə‍ʊˌɪnsɪdˈɛntə‍li], \k_əʊ_ˌɪ_n_s_ɪ_d_ˈɛ_n_t_əl_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd