Postal abbreviation of Massachusetts, a state of the United States of America.
Maluku, a province of Indonesia.
Maranhão, a state of Brazil.
The upper legislative body of many of the states of the United States.
Any of several legislative bodies. (In countries which have multiple legislative bodies, the Senate is often the more senior.)
The Senate of Canada; the upper house of the Canadian parliament; "the Senate".
The United States Senate.
The council that governed the ancient Roman Republic.