Senator

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Middle English (denoting a member of the ancient Roman senate): from Old French senateur, from Latin senator (see senate).

wiktionary

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From Latin senātor, ultimately from senex(“old”).

etymonline

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senator (n.)

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" (from PIE root *sen- "old"). 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.