SUBMARGINAL

\sˈʌbmɑːd͡ʒˌɪnə͡l], \sˈʌbmɑːd‍ʒˌɪnə‍l], \s_ˈʌ_b_m_ɑː_dʒ_ˌɪ_n_əl]\
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1920 - A dictionary of scientific terms (6th edition)
By J.H. Kenneth
 
1908 - Chambers's Twentieth Century Dictionary of the English Language
By Thomas Davidson