HMI /ˌeɪtʃ em ˈaɪ/ BrE AmE noun abbreviation for
His/Her Majesty's Inspector; a British government official, employed by ↑ Ofsted whose job is to check the standards of education in schools in the UK. HMIs visit schools and watch lessons, then they make reports about the teachers, the lessons, and the general character of the school.