prae·no·men /priˈnomən/
  第一個名字
  Præ·no·men n.; pl. Prænomina   Rom. Antiq. The first name of a person, by which individuals of the same family were distinguished, answering to our Christian name, as Caius, Lucius, Marcus, etc.
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  praenomen
       n : the first name of a citizen of ancient Rome
       [also: praenomina (pl)]