SPONTANEOUS EVOLUTION

\spɒntˈe͡ɪni͡əs ɪvəlˈuːʃən], \spɒntˈe‍ɪni‍əs ɪvəlˈuːʃən], \s_p_ɒ_n_t_ˈeɪ_n_iə_s ɪ_v_ə_l_ˈuː_ʃ_ə_n]\
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1846 - Medical lexicon: a dictionary of medical science
By Robley Dunglison
 
1898 - American pocket medical dictionary
By Willam Alexander Newman Dorland