Oxford Dictionary English headmistress noun noun BrE BrE//ˌhedˈmɪstrəs// ; NAmE NAmE//ˌhedˈmɪstrəs// (usually North American English principal) Teaching and learning, School life Add to my wordlistjump to other results a female teacher who is in charge of a school, especially a private school see also head teacher See related entries: Teaching and learning, School lifeSee headmistress in the Oxford Advanced American DictionaryCheck pronunciation: headmistress oxfordlearnersdictionaries.com