n. A woman who has authority over a manor or family; the mistress of a household: the feminine correlative to lord.n. Specifically, in Great Britain, the proper title of any woman whose husband is higher in rank than baronet or knight, or who is the daughter of a nobleman not lower than an earl, though the title is given by courtesy also to the wives of baronets and knights; also, the feminine title correlative originally to Lord, and now also to Sir.n. In the days of chivalry, the woman chosen by a knight or squire as the object of his especial service, his feats of arms being done in her honor, and his success ascribed to her influence.n. A woman of good family and of established social position, or one accepted as such: a restricted sense correlative to gentleman in like use.n. A woman of good breeding, education, and refinement of mind and manner: a general sense correlative to gentleman in like use: in common speech used indiscriminately as a synonym for woman (a use generally vulgar, and to be avoided except in address). See gentleman, 4.n. A wife; a man's spouse: used in this sense always with direct reference to the husband: as, John Smith and lady.n. A sweetheart.n. A slate measuring about 16 inches long by 10 broad.n. The calcareous apparatus in the cardiac part of the stomach of the lobster, the function of which is the trituration of the food.Of a lady; ladylike.n. In astrology, a term designating the planet Venus when in the circumstances under which, if a masculine planet, she would be termed lord: as, lady of the ascendant.