INTENSIVELY

\ɪntˈɛnsɪvli], \ɪntˈɛnsɪvli], \ɪ_n_t_ˈɛ_n_s_ɪ_v_l_i]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1871 - The Cabinet Dictionary of the English Language