IMPONDERABILITY

\ɪmpˌɒndəɹəbˈɪlɪti], \ɪmpˌɒndəɹəbˈɪlɪti], \ɪ_m_p_ˌɒ_n_d_ə_ɹ_ə_b_ˈɪ_l_ɪ_t_i]\
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1916 - Appleton's medical dictionary
By Smith Ely Jelliffe
 
1871 - The Cabinet Dictionary of the English Language