"Grammar" is a word in ENGLISH

treatise on the elements or principles of any science; as,
a grammar of geography.

The science which treats of the principles of language;
the study of forms of speech, and their relations to one another; the
art concerned with the right use aud application of the rules of a
language, in speaking or writing.

The art of speaking or writing with correctness or
according to established usage; speech considered with regard to the
rules of a grammar.

A treatise on the principles of language; a book
containing the principles and rules for correctness in speaking or
writing.

To discourse according to the rules of grammar; to use
grammar.