Definition of lady :
1. A wife; - not now in approved usage.
2. A woman having proprietary rights or authority; mistress; - a feminine correlative of lord.
3. A woman of refined or gentle manners; a well- bred woman; - the feminine correlative of gentleman.
4. A woman of social distinction or position. In England, a title prefixed to the name of any woman whose husband is not of lower rank than a baron, or whose father was a nobleman not lower than an earl. The wife of a baronet or knight has the title of Lady by courtesy, but not by right.
5. A woman to whom the particular homage of a knight was paid; a woman to whom one is devoted or bound; a sweetheart.
6. A woman who looks after the domestic affairs of a family; a mistress; the female head of a household.
7. Belonging or becoming to a lady; ladylike.
8. The day of the annunciation of the Virgin Mary, March 25. See Annunciation.
9. The triturating apparatus in the stomach of a lobster; - so called from a fancied resemblance to a seated female figure. It consists of calcareous plates.
woman (part of speech: noun)