union high school

(US) A high school or high school district that serves students from more than one elementary school district.

Japanese Meaning

複数の小学校学区からの生徒を受け入れる高等学校または高等学校地区

Students from three elementary school districts will attend the new union high school starting next fall.

3つの小学校区の生徒は来年の秋から、新しく開校する複数の小学校区から生徒を受け入れる高等学校に通います。

Sense（1）

(US) A high school or high school district that serves students from more than one elementary school district.

union high schools

（ plural ）