middle school
US /ˈmɪd.əl ˌskuːl/
UK /ˈmɪd.əl ˌskuːl/

1.
escuela secundaria
a school for children between the ages of about 11 and 14, typically comprising grades 6, 7, and 8
:
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My daughter just started middle school this year.
Mi hija acaba de empezar la escuela secundaria este año.
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He teaches history at a local middle school.
Él enseña historia en una escuela secundaria local.