PROPORTIONABLY

\pɹəpˈɔːʃənəblɪ], \pɹəpˈɔːʃənəblɪ], \p_ɹ_ə_p_ˈɔː_ʃ_ə_n_ə_b_l_ɪ]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer
 
1899 - The american dictionary of the english language.
By Daniel Lyons
 
1871 - The Cabinet Dictionary of the English Language