RETROGRADINGLY

\ɹˌɛtɹə͡ʊɡɹˈe͡ɪdɪŋlɪ], \ɹˌɛtɹə‍ʊɡɹˈe‍ɪdɪŋlɪ], \ɹ_ˌɛ_t_ɹ_əʊ_ɡ_ɹ_ˈeɪ_d_ɪ_ŋ_l_ɪ]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.