SPECIALIZATION

\spˌɛʃə͡la͡ɪzˈe͡ɪʃən], \spˌɛʃə‍la‍ɪzˈe‍ɪʃən], \s_p_ˌɛ_ʃ_əl_aɪ_z_ˈeɪ_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd
 
1914 - Nuttall's Standard dictionary of the English language
By Nuttall, P.Austin.