What does "baron" mean?

Baron: (Old Law) A husband; as, baron and feme, husband and wife. [R.] Cowell. Baron of beef, two sirloins not cut asunder at the backbone. -- Barons of the Cinque Ports, formerly members of the House of Commons, elected by the seven Cinque Ports, two for each port. -- Baron of the exchequer, the judges of the Court of Exchequer, one of the three ancient courts of England, now abolished.