DIFFICULTNESS

\dˈɪfɪkə͡ltnəs], \dˈɪfɪkə‍ltnəs], \d_ˈɪ_f_ɪ_k_əl_t_n_ə_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1899 - The american dictionary of the english language.
By Daniel Lyons