SERIOUSLY

\sˈi͡əɹɪəsli], \sˈi‍əɹɪəsli], \s_ˈiə_ɹ_ɪ__ə_s_l_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1871 - The Cabinet Dictionary of the English Language