TRIMESTRIAL

\tɹa͡ɪmˈɛstɹɪəl], \tɹa‍ɪmˈɛstɹɪəl], \t_ɹ_aɪ_m_ˈɛ_s_t_ɹ_ɪ__ə_l]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.