The definition of a lady are as follows:

1. A well-mannered and considerate woman with high standards of proper behavior.

2. a. A woman regarded as proper and virtuous.

b. A well-behaved young girl.

3. A woman who is the head of the household.

4. A woman, especially when spoken of or to in a polite way.

5. a. A woman to whom a man is romantically attached

b. Informal. A wife.

6. Cheifly British. A general feminine titile of nobility and other rank, specifically:

a. Used as a title for the wife or widow of a knight or baronet.

b. Used as a form of address for a marchioness, countess, viscountess, baroness or baronetess.

c. Used as a courtesy title for the daughter of a duke, a marquis or an earl.

7. Slang. Cocaine.