Definition of grammar

grammar Noun A system of rules and principles for speaking and writing a language.
grammar Noun The study of the internal structure of words (morphology) and the use of words in the construction of phrases and sentences (syntax).
grammar Noun A book describing the rules of grammar of a language.
grammar Noun A formal system specifying the syntax of a language.
grammar Noun A formal system defining a formal language
grammar Noun The basic rules or principles of a field of knowledge or a particular skill.
grammar Noun a textbook.