Meaning of GRAMMAR in English

GRAMMAR

[noun] [U] - (the study or use of) the rules about how words change their form and combine with other words to make sentencesI think it's important for children to be taught grammar.He's finding it difficult to learn Russian grammar.If students' grammar isn't corrected, they'll never learn to use it properly.In English, it's bad grammar to say "you was".A grammar is a book which describes the rules about how words change their form and combine with other words to make sentences in a particular language.I've just bought a German grammar.In Britain, esp. in the past, a grammar school is a school for children aged 11-18 who are good at studying. In America, esp. in the past, it is a school for children aged 5-12/14.

Cambridge English vocab.      Кембриджский английский словарь.