noun

• 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.
• The title for someone who is elected to be a senator.