VOCATIVE CASE

\vˈə͡ʊkətˌɪv kˈe͡ɪs], \vˈə‍ʊkətˌɪv kˈe‍ɪs], \v_ˈəʊ_k_ə_t_ˌɪ_v k_ˈeɪ_s]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd