What does the word mistress mean?

Usage examples for mistress

  1. Oh, you might leave me and go with your present mistress! – In the Heart of a Fool by William Allen White
  2. Come, mistress- pray answer to this. – Guy Rivers: A Tale of Georgia by William Gilmore Simms
  3. I remember when Dr. Pretyman ordered it for my poor dear mistress. – The Young Duke by Benjamin Disraeli