Source : Webster's Revised Unabridged Dictionary (1913)

Senator \Sen"a*tor\, n. [OE. senatour, OF. senatour, F.
   s['e]nateur, fr. L. senator.]
   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. --Burrill.

Source : WordNet®

senator
     n : a member of a senate