A member, normally elected, in the house or chamber of a legislature called a senate, as, for instance, the legislatures of the United States and Canada.
(dated) A member of any legislative body or parliament, particularly the British Parliament.
(historical) A member of the ancient Roman Senate.
(historical) A member of a governing council in other states in the ancient world.
A member of the ruler’s council or governing council in general, a leading statesman.
(obsolete) An important church official.
In Germany, a minister of the executive branch of government in the city states of Berlin, Bremen, and Hamburg; and a government official of cities that were part of the Hanseatic League.