ATTENUATE, ATTENUATED

\ɐtˈɛnjuːˌe͡ɪt], \ɐtˈɛnjuːˌe‍ɪt], \ɐ_t_ˈɛ_n_j_uː_ˌeɪ_t]\
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1899 - The american dictionary of the english language.
By Daniel Lyons
 
1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald