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Senator (noun)
A member, normally elected, in the house or chamber of a legislature called a senate. The legislatures of the United States and Canada have senators.
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Senator (noun)
A position in government held in ancient Rome by experienced, elder officials as advisors or consultants for younger, less experienced functionaries.
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Senator (noun)
A member of the king’s council.
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Congressman (noun)
A male member of congress.
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Congressman (noun)
A male member of the House of Representatives.
Wiktionary