The term 'schoolmistress' refers exclusively to women, similar to 'headmistress' for female school leaders. The new schoolmistress introduced innovative teaching methods.
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Authority Implied
The word implies authority and responsibility within the school environment. As the schoolmistress, she oversaw the entire curriculum.
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Not Universal
The use of 'schoolmistress' is more common in British English and might be rare or old-fashioned elsewhere. She admired her grandmother's stories as a schoolmistress.