INTENERATION

\ɪntˌɛnəɹˈe͡ɪʃən], \ɪntˌɛnəɹˈe‍ɪʃən], \ɪ_n_t_ˌɛ_n_ə_ɹ_ˈeɪ_ʃ_ə_n]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan