six-year secondary school
A type of school established under the 1998 revision of the Japanese School Education Law, combining lower and upper secondary education into a single six-year program.
A six-year secondary school is a school that provides consistent education from junior high through high school.
中等教育学校 is a legally defined single institution combining junior and senior high under one roof, whereas 中高一貫校 can also refer to affiliated but separate junior and senior high schools sharing a curriculum.
Compound of 中等 (secondary) + 教育 (education) + 学校 (school). The term was officially adopted following the 1998 amendment to the School Education Law.