SUPERIMPOSITION

\sˌuːpəɹɪmpəzˈɪʃən], \sˌuːpəɹɪmpəzˈɪʃən], \s_ˌuː_p_ə_ɹ_ɪ_m_p_ə_z_ˈɪ_ʃ_ə_n]\
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1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.