RATIONAIISM

\ɹˈaʃənˌa͡ɪɪzəm], \ɹˈaʃənˌa‍ɪɪzəm], \ɹ_ˈa_ʃ_ə_n_ˌaɪ_ɪ_z_ə_m]\
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1919 - The Concise Standard Dictionary of the English Language
By James Champlin Fernald