ASSERVERATION

\ɐsˌɜːvəɹˈe͡ɪʃən], \ɐsˌɜːvəɹˈe‍ɪʃən], \ɐ_s_ˌɜː_v_ə_ɹ_ˈeɪ_ʃ_ə_n]\
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1790 - A Complete Dictionary of the English Language
By Thomas Sheridan