AUTUMNAL-EQUINOX

\ˈɔːtʌmnə͡lˈɛkwɪnˌɒks], \ˈɔːtʌmnə‍lˈɛkwɪnˌɒks], \ˈɔː_t_ʌ_m_n_əl_ˈɛ_k_w_ɪ_n_ˌɒ_k_s]\
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1871 - The Cabinet Dictionary of the English Language