IMPERATIVAL

\ɪmpˈɜːɹɐtˌɪvə͡l], \ɪmpˈɜːɹɐtˌɪvə‍l], \ɪ_m_p_ˈɜː_ɹ_ɐ_t_ˌɪ_v_əl]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.