The word "sensei" is derived from the Chinese word "shēngrén," which means "sage" or "master." In Japanese, the word "sensei" is written with the same kanji characters as the word "shēngrén," and it has the same meaning.
The title "sensei" is not only used for teachers in schools. It is also used for teachers in private schools, tutors, and even for people who are not professional teachers but who have a lot of knowledge and experience in a particular field. For example, a martial arts instructor might be called "sensei," or a doctor might be called "sensei" by their patients.
In Japanese culture, the teacher-student relationship is highly valued. Teachers are seen as role models and as sources of knowledge and wisdom. Students are expected to respect their teachers and to learn from them not only academically, but also morally and ethically.
The title "sensei" reflects the high status that teachers have in Japanese culture. It is a title that is used to show respect and admiration for those who have dedicated their lives to educating others.