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c.1200, "member of an (ancient) senate," from Old French senator (Modern French sénateur), from Latin senator "member of the senate," from senex "old; old man" (see senate). An Old English word for one was folcwita. As "member of a (modern) governing body" from late 14c.; specifically in U.S. use from 1788. Fem. form senatress attested from 1731. The Senators was the name of the professional baseball team in Washington, D.C., from 1891 to 1971.