COURTESY n.
Favor or indulgence, as distinguished from right; as, a title given one by courtesy. Courtesy title, a title assumed by a person, or popularly conceded to him, to which he has no valid claim; as, the courtesy title of Lord prefixed to the names of the younger sons of noblemen.
COUSIN n.
A title formerly given by a king to a nobleman, particularly to those of the council. In English writs, etc., issued by the crown, it signifies any earl. My noble lords and cousins, all, good morrow. Shak.