Meaning of “grammar school” - Learner’s Dictionary

grammar school

noun [ C, U ] us uk

in the UK, a school that clever children over 11 years old can go to if they pass a special exam

IN US US old-fashioned

another word for elementary school (= a school for children from the ages of five to eleven in the US)

(Definition of “grammar school” from the Cambridge Learner’s Dictionary © Cambridge University Press)