Meaning of GRAMMAR in English

GRAMMAR

/ ˈgræmə(r); NAmE / noun

1.

[ U ] the rules in a language for changing the form of words and joining them into sentences :

the basic rules of grammar

English grammar

—see also generative grammar

2.

[ U ] a person's knowledge and use of a language :

His grammar is appalling.

bad grammar

3.

[ C ] a book containing a description of the rules of a language :

a French grammar

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WORD ORIGIN

late Middle English : from Old French gramaire , via Latin from Greek grammatikē (tekhnē) (art) of letters, from gramma , grammat- letter of the alphabet, thing written.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.