a person whose job is to help students learn in a school, college, or other place of education
The teacher wrote the math problem on the board.
Our English teacher always starts class with a funny story.
✦ From Old English ‘tǣċere’, meaning ‘one who teaches’, derived from the verb ‘teach’.
something, such as an experience or example, that gives you important lessons about life or how to do something
Failure can be a tough teacher, but it helps you grow.
Travel is a great teacher of patience and adaptability.
✦ The figurative sense developed in the 16th century by extending the literal idea of a person who teaches to abstract forces that shape understanding.
the teacher who is in charge of a school and responsible for its management
The headteacher gave an inspiring speech at the school assembly.
Our new headteacher is organizing a trip to the museum.
✦ Formed in the 19th century by combining 'head' (chief or leader) and 'teacher', reflecting the role of the leading educator in a school.
