PERTINATE

\pˈɜːtɪnˌe͡ɪt], \pˈɜːtɪnˌe‍ɪt], \p_ˈɜː_t_ɪ_n_ˌeɪ_t]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.