19. any class, kind, or sort, as of persons or things, distinguished from others by nature or character: talents of a high order.
21. a rank, grade, or class of persons in a community.
25. a monastic society or fraternity: the Franciscan order.
35. (initial capital letter) British. a. a special honor or rank conferred by a sovereign upon a person for distinguished achievement.
http://dictionary.reference.com/browse/order
Describes a peerage doesn't it.