magistra

noun3

1. •
   A woman with power or authority, such as a teacher or archmage; a mistress.

   • Your grandmother must have provided assistance to the magistra at some point. — 2002
2. •
   A female magister.

   • Meditation has an important part in many witchcraft ceremonies, at least in the coven of which I am the Magistra or leader. — 1989
3. •
   Female equivalent of magister.