DISSERTATIONAL

\dɪsətˈe͡ɪʃənə͡l], \dɪsətˈe‍ɪʃənə‍l], \d_ɪ_s_ə_t_ˈeɪ_ʃ_ə_n_əl]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.