1398, "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 c.1440; sense of "noble class collectively" is from 1530.