UNDULATING

\ˈʌndjʊlˌe͡ɪtɪŋ], \ˈʌndjʊlˌe‍ɪtɪŋ], \ˈʌ_n_d_j_ʊ_l_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.
 
1874 - Etymological and pronouncing dictionary of the English language
By Stormonth, James, Phelp, P. H.