INTERMEDIATION

\ˌɪntəmˌiːdɪˈe͡ɪʃən], \ˌɪntəmˌiːdɪˈe‍ɪʃən], \ˌɪ_n_t_ə_m_ˌiː_d_ɪ__ˈeɪ_ʃ_ə_n]\
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1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer
 
1871 - The Cabinet Dictionary of the English Language