PROPORTIONABLE

\pɹəpˈɔːʃənəbə͡l], \pɹəpˈɔːʃənəbə‍l], \p_ɹ_ə_p_ˈɔː_ʃ_ə_n_ə_b_əl]\
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2006 - WordNet 3.0
By Princeton University
 
1899 - The american dictionary of the english language.
By Daniel Lyons