DISPROPORTIONALLY

\dˌɪspɹəpˈɔːʃənə͡li], \dˌɪspɹəpˈɔːʃənə‍li], \d_ˌɪ_s_p_ɹ_ə_p_ˈɔː_ʃ_ə_n_əl_i]\
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1871 - The Cabinet Dictionary of the English Language
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan