lady
noun
ˈleɪdi 
ˈleɪdi 
1 [countable] a word used to mean ‘woman’ that some people, especially older people, consider is more politeThere's a lady waiting to see you.He was with an attractive young lady.the ladies' golf championship (British English) a tea lady (= a woman who serves tea in an office) (North American English, approving) She's a tough lady.a lady doctor/golferHelp
Some women object to the way lady is used in some of these examples and prefer it to be avoided if possible: a doctor/a woman doctor 2 [countable] a woman who is polite and well educated, has excellent manners and always behaves wellHis wife was a real lady. compare gentleman3 [countable, usually plural] (formal) used when speaking to or about a girl or woman, especially somebody you do not knowCan I take your coats, ladies?Could I have your attention, ladies and gentlemen?Help
Some women do not like ladies used on its own, as in the first example, and prefer it to be left out.4 [singular] (especially North American English) an informal way to talk to a woman, showing a lack of respectListen, lady, don't shout at me.5 [countable] (old-fashioned) (in Britain) a woman belonging to a high social classthe lords and ladies of the courta lady's maid6 Lady [countable] (in Britain) a title used by a woman who is a member of the nobility, or by somebody who has been given the title ‘lady’ as an honour. The wives and daughters of some members of the nobility and the wives of knights are also called ‘Lady’Lady HoweLady Jane Grey compare Lord, Sir7 a/the ladies [uncountable] (British English) (North American English ladies' room [countable]) a toilet/bathroom for women in a public building or placeCould you tell me where the ladies is?8 Our Lady a title used to refer to Mary, the mother of Christ, especially in the Roman Catholic ChurchOur Lady of Lourdes Idioms
see it's not over until the fat lady sings at fat adjective, a gentleman/lady of leisure at leisure