High School vs. Secondary School
“High school” and “secondary school” overlap in referring to later school education, but they belong to different education systems and age ranges. Cambridge defines US high school around grades 9–12, while secondary school is mainly UK and approximately ages 11–18.
“High school” is the standard US term for older secondary-level students; “secondary school” is mainly UK and covers a broader approximate 11–18 range. The terms overlap but school systems and age ranges do not map perfectly.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| US educational context, typically later secondary grades | high school | Use the US term when that system is intended. |
| UK or broader international secondary-level context | secondary school | Use the term appropriate to that education system. |
| cross-system comparison | system-specific wording plus age/grade detail | Do not assume the terms map perfectly across countries. |
Quick tests
Meaning / construction test
Are you writing specifically about the US school system?
If yes: Use “high school” where it matches the US level being described.
If no: Use “secondary school” or the local system’s term, and give ages/grades when exact equivalence matters.
Caveat: Education systems differ in age ranges and institutional structure, so the terms overlap without being universal equivalents.
Examples
She teaches at a high school in California.
The US system context supports “high school.”
He attended secondary school in England.
The UK context supports “secondary school.”
The exchange guide lists both the local school stage and the students’ ages.
System-specific details avoid false one-to-one equivalence.
Further guidance
Core difference
Use “high school” for the US institution typically serving grades 9–12; “secondary school” is the broader/mainly UK term for post-primary schooling.
Fast Test
Name the institution using the terminology of the education system you are describing rather than translating mechanically by age alone.
Usage Boundary
School structures differ by country and region, so do not imply a perfect one-to-one equivalence for every student age or institution.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- high school — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Direct education-vocabulary evidence defining US high school and noting UK/Australian naming use.
- secondary school — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Direct education-vocabulary evidence that secondary school is mainly UK and corresponds broadly to high school in the American dictionary sense, with age-range differences.