/ 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.