ACCELERATING

\ɐksˈɛləɹˌe͡ɪtɪŋ], \ɐksˈɛləɹˌe‍ɪtɪŋ], \ɐ_k_s_ˈɛ_l_ə_ɹ_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.