FIRST-CLASS MAIL

\fˈɜːstklˈas mˈe͡ɪl], \fˈɜːstklˈas mˈe‍ɪl], \f_ˈɜː_s_t_k_l_ˈa_s m_ˈeɪ_l]\

Definitions of FIRST-CLASS MAIL

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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd