SERIOSO

\sˈi͡əɹɪˈə͡ʊsə͡ʊ], \sˈi‍əɹɪˈə‍ʊsə‍ʊ], \s_ˈiə_ɹ_ɪ__ˈəʊ_s_əʊ]\
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1919 - The concise Oxford dictionary of current English
By Sir Augustus Henry