What does "noble" mean?

Additional senses

1. 2.Of exalted rank; of or pertaining to the nobility; distinguished from the masses by birth, station, or title; highborn; as, noble blood; a noble personage. Note: Noble is used in the formation of self-explaining compounds; as, noble-born, noble-hearted, noble-minded. Noble metals (Chem.), silver, gold, and platinum; -- so called from their freedom from oxidation and permanence in air. Copper, mercury, aluminium, palladium, rhodium, iridium, and osmium are sometimes included.
2. 3.A person of rank above a commoner; a nobleman; a peer.
3. 4.An English money of account, and, formerly, a gold coin, of the value of 6 s. 8 d. sterling, or about $1.61.
4. 5.(Zoöl.) A European fish; the lyrie.
5. 6.To make noble; to ennoble. [Obs.] Thou nobledest so far forth our nature. Chaucer.