0 a polite or old-fashioned way of referring to or talking to a woman: --
1 a title given in the UK to a woman or girl who has the social rank of a peer, or to the wife of a peer or knight: --
Sir Charles and Lady Finlater
Lady Diana Spencer
2 a woman who is polite and behaves well toward other people: --
3 (in some countries) the title of a woman who has, or is the wife of a man who has, a specially high social rank, or the person herself --