0 a female nurse in a school --
1 old-fashioned for senior nursing officer UK --
2 a woman who is in charge of female prisoners --
3 a married woman, especially one who is old or a widow (= a woman whose husband has died) --
4 a married woman who is old enough and of a high enough social class to have the respect of others --
5 a woman who is in charge of women or children at a hospital, police station, prison, or school --