PERIODIC EVENT

\pˌi͡əɹɪˈɒdɪk ɪvˈɛnt], \pˌi‍əɹɪˈɒdɪk ɪvˈɛnt], \p_ˌiə_ɹ_ɪ__ˈɒ_d_ɪ_k ɪ_v_ˈɛ_n_t]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd