grammar

n. study of the structure of a language

For the rules of English grammar, see English grammar and Disputes in English grammar. For the topic in theoretical computer science, see Formal grammar Grammar is the study of the rules governing the use of a given natural language, and as such a field of linguistics. Traditionally, grammar included  morphology and syntax, in modern linguistics commonly expanded by the subfields of phonetics, phonology, orthography, semantics, and pragmatics.
See more at Wikipedia.org...

Syntax, n a property of language involving structural cues for the arrangement of words as elements in a phrase, clause, or sentence. [more]Grammar - Community and Resources

Noun
1. studies of the formation of basic linguistic units
(hypernym) synchronic linguistics, descriptive linguistics
(hyponym) syntax
(class) syntactically independent

(v. i.)
To discourse according to the rules of grammar; to use grammar.
  

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

(n.)
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.
  

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

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