PERPENDICULARITY

\pˌɜːpəndˌɪkjʊlˈaɹɪti], \pˌɜːpəndˌɪkjʊlˈaɹɪti], \p_ˌɜː_p_ə_n_d_ˌɪ_k_j_ʊ_l_ˈa_ɹ_ɪ_t_i]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1899 - The american dictionary of the english language.
By Daniel Lyons