MASON AND DIXON'S LINE

\mˈe͡ɪsən and dˈɪksənz lˈa͡ɪn], \mˈe‍ɪsən and dˈɪksənz lˈa‍ɪn], \m_ˈeɪ_s_ə_n a_n_d d_ˈɪ_k_s_ə_n_z l_ˈaɪ_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1894 - Dictionary of United States history
By John Franklin Jameson