Definition of Eari
A title of nobility, formerly the highest in England, now the third, ranking between a marquis and a viscount, and corresponding with the French“comte" and the German "Graf.” The title originated with the Saxons, and is the most ancient of the English peer - age. William the Conqueror first made this title hereditary, giving it In fee to his nobles; and allotting them for the support of their state the third penny out of the sheriffs court, issuing out of all pleas of the shire, whence they had their ancient title “shiremen.” At present the title is accompanied by no territory, private or judicial rights, but merely confers nobility and an hereditary seat in the house of lords.
That's the definition of Eari in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.