IMPENETRABILITY

\ɪmpˌɛnɪtɹəbˈɪlɪti], \ɪmpˌɛnɪtɹəbˈɪlɪti], \ɪ_m_p_ˌɛ_n_ɪ_t_ɹ_ə_b_ˈɪ_l_ɪ_t_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1871 - The Cabinet Dictionary of the English Language
 
1790 - A Complete Dictionary of the English Language
By Thomas Sheridan