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.
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(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.
  

token expression tree context lexeme recursive descent parser LL context clash Extended Affix Grammar Attribute Translation System metasyntax metasyntactic variable Backus-Naur Form Pleuk grammar development system 

A formal definition of the syntactic structure of a language (see syntax), normally given in terms of production rules which specify the order of constituents and their sub-constituents in a sentence (a well-formed string in the language). Each rule has a left-hand side symbol naming a syntactic category (e.g. "noun-phrase" for a natural language grammar) and a right-hand side which is a sequence of zero or more symbols. Each symbol may be either a terminal symbol or a non-terminal symbol. A terminal symbol corresponds to one "lexeme" - a part of the sentence with no internal syntactic structure (e.g. an identifier or an operator in a computer language). A non-terminal symbol is the left-hand side of some rule.
One rule is normally designated as the top-level rule which gives the structure for a whole sentence.
A grammar can be used either to parse a sentence (see parser) or to generate one. Parsing assigns a terminal syntactic category to each input token and a non-terminal category to each appropriate group of tokens, up to the level of the whole sentence. Parsing is usually preceded by lexical analysis. Generation starts from the top-level rule and chooses one alternative production wherever there is a choice.
See also BNF, yacc, attribute grammar, grammar analysis.

To dream that you are studying grammar, denotes you are soon to make a wise choice in momentous opportunities.