grammar school

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Chiefly British A secondary or preparatory school.
• noun A school stressing the study of classical languages.

from The Century Dictionary.

• noun A school for teaching grammar; originally, a school for teaching Latin, which was begun by committing the grammar to memory.
• noun Hence In the system of graded common schools in the United States, the grade or department in which English grammar is one of the subjects taught. The more common practice recognizes primary, grammar, and high schools; sometimes the division is into primary, intermediate, grammar, and high schools.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun archaic A school that teaches its pupils the grammar system of a European language, especially Latin and Greek.
• noun chiefly UK A secondary school that stresses academic over practical or vocational education, until recent times open to those pupils who had passed the 11-plus examination.
• noun US, rare, regional Elementary school.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a school for young children; usually the first 6 or 8 grades
• noun a secondary school emphasizing Latin and Greek in preparation for college