UNARY OPERATION

\ʌnˈɑːɹi ˌɒpəɹˈe͡ɪʃən], \ʌnˈɑːɹi ˌɒpəɹˈe‍ɪʃən], \ʌ_n_ˈɑː_ɹ_i_ ˌɒ_p_ə_ɹ_ˈeɪ_ʃ_ə_n]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd