a socially or politically privileged class whose titles are conferred by descent or by royal decree
2.
the state or quality of being morally or spiritually good; dignity: the nobility of his mind
3.
(in the British Isles) the class of people holding the titles of dukes, marquesses, earls, viscounts, or barons and their feminine equivalents collectively; peerage
late 14c., "quality of being excellent or rare," from O.Fr. nobilite (Fr. nobilité), from L. nobilitatem (nom. nobilitas) "nobleness," from nobilis "well-known, prominent" (see noble). Meaning "quality of being of noble rank or birth" is attested from mid-15c.; sense