What does "secondary education" mean?

Education that follows primary education and leads to either employment or college / university education.

What is a synonym for "secondary education"?

Common synonyms include: elementary education, high school.

noun

noun ·Rare ·Advanced level

Noun

1
Education that follows primary education and leads to either employment or college / university education. uncountable
2
education beyond the elementary grades; provided by a high school or college preparatory school wordnet

From secondary + education.