(In countries which have multiple legislative bodies, the Senate is often the more senior.) Any of several legislative bodies.

(historical) The council that governed the ancient Roman Republic.

(Canada) The Senate of Canada; the upper house of the Canadian parliament; "the Senate".

(US) The United States Senate.

(US) The upper legislative body of many of the states of the United States.

In some bicameral legislative systems, the upper house or chamber.

A group of experienced, respected, wise individuals serving as decision makers or advisors in a political system or in institutional governance, as in a university, and traditionally of advanced age and male.