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Longman Dictionary of Contemporary English
secondary school
noun
EXAMPLES FROM CORPUS
▪ By secondary school there will be several hundred.
▪ Many of them bring not only immigrant drive and first-generation values but a solid, if narrow, secondary school education.
▪ Too rarely has it involved the specialist in the secondary school in regular discussion with primary colleagues.
Wiktionary
secondary school

n. 1 (lb en schools British) In the UK, a state school attended between the ages of 11 and 16 or 18. 2 (lb en education American) The federally designated, graduation-separated classification of grades 9–12 (approximately ages 14–18), regardless of whether they are compiled together in one school or separate from the other grades.

WordNet
secondary school

n. a school for students intermediate between elementary school and college; usually grades 9 to 12 [syn: lyceum, lycee, Gymnasium, middle school]

Wikipedia
Secondary school

A secondary school, often referred to as a high school or a senior high school, is a school which provides secondary education, between the ages of 11 and 19 depending on location, after primary school and before higher education.