noun
1. obsolete : a school in England intended especially for children from middle-class families
2. : a school or a division in the school system in any of various foreign countries embracing class levels that correspond approximately to those of the American junior and senior high schools and in some countries also class levels that correspond approximately to the upper grades of the American elementary school
3.
a. : a division in some private schools embracing class levels that correspond approximately to those of the junior high school
b. : a school or a division in the school system in any of various foreign countries embracing class levels that correspond approximately to those of the American junior high school
4. : a division in some private or public schools embracing or approximately embracing the upper elementary grades