secondary school
US /ˈsek.ən.der.i skuːl/
UK /ˈsek.ən.der.i skuːl/

1.
a school for children between the ages of 11 and 18
:
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My daughter just started secondary school this year.
•
After primary school, children go to secondary school.
a school for children between the ages of 11 and 18