Meaning of GRAMMAR in English
gram ‧ mar S3 W3 /ˈɡræmə $ -ər/ BrE AmE noun
[ Date: 1300-1400 ; Language: Old French ; Origin: gramaire , from Latin grammatica , from Greek grammatikos 'of letters' , from gramma ; ⇨ ↑ gram ]
1 . [uncountable] the rules by which words change their forms and are combined into sentences, or the study or use of these rules:
Check your spelling and grammar.
the rules of English grammar
2 . [countable] a particular description of grammar or a book that describes grammar rules:
A dictionary lists the words, a grammar states the rules.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012