Lady is a term for a woman who behaves in a polite and dignified way.
The word "lady" can also refer to:
1. A woman of high social position or good manners
2. A polite way to address a woman (e.g. "Excuse me, lady")
3. The female head of a household (e.g. "the lady of the house")
4. In British context, a title for certain noblewomen (e.g. "Lady Diana")
5. Slang usage in phrases like "my lady" or "hey lady"