Definition of "senate"

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

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.  quotations  examples

In Germany, the executive branch of government in the city states of Berlin, Bremen, and Hamburg; the governments of cities that were part of the Hanseatic League; and the bench in a higher appellate court.  examples