SIMULTANEOUS

\sˌɪməltˈe͡ɪni͡əs], \sˌɪməltˈe‍ɪni‍əs], \s_ˌɪ_m_ə_l_t_ˈeɪ_n_iə_s]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
1894 - The Clarendon dictionary
By William Hand Browne, Samuel Stehman Haldeman
 
1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald