sen·a·tor /ˈsɛnətɚ/
  參議院議員,上議院議員,現任參議員
  Sen·a·tor n.
  1. A member of a senate.
     The duke and senators of Venice greet you.   --Shak.
  Note: ☞ In the United States, each State sends two senators for a term of six years to the national Congress.
  2. O.Eng.Law A member of the king's council; a king's councilor.
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  senator
       n : a member of a senate