AUTHENTICATING

\ɔːθˈɛntɪkˌe͡ɪtɪŋ], \ɔːθˈɛntɪkˌe‍ɪtɪŋ], \ɔː_θ_ˈɛ_n_t_ɪ_k_ˌeɪ_t_ɪ_ŋ]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.