Honorific second-person pronoun used in letters when addressing a woman. Formal and somewhat old-fashioned; not used in everyday conversation.
Dear Madam, I hope this letter finds you in ever-increasing prosperity.
Refers to a woman of noble birth or high social standing. Literary and somewhat archaic; modern Japanese would more commonly use 貴婦人 or 淑女.
The painting depicts an elegant noblewoman.
貴婦人 is the modern, more common word for a noblewoman or lady, whereas 貴女 in this sense is literary and archaic.
淑女 describes a refined, well-mannered woman and is used far more often in modern Japanese than the archaic 貴女 in this meaning.
Compound of 貴 (noble, honorable) and 女 (woman). The pronoun usage developed from respectful address in correspondence.