governeress

noun5

1. •
   (old-fashioned) A female governor.

   • I was introduced by Mrs. Onward, the Governoress, to Mrs. Sapient, the Speakeress of the House. — 1869
2. •
   (nonstandard) A woman employed to educate children in private households.

   • It took a firm governoress, boarding school and a finishing school to get rid of the rough edges — and, by her late teens, the young Princess [Alexandra] was emerging as a beautiful and serene woman. — 1986
3. •
   A governess (woman employed to educate children).
4. •
   A woman who rules or governs.
5. •
   (old-fashioned) The wife of a governor.

   • Colonel Braddyll, soon after his marriage, was chosen governor of ⸺, in India, and Mrs. Braddyll, as governoress, or governor’s lady, was in the height of her glory. — 1820