Look up grammar in Wiktionary, the free dictionary.

Grammar is the system of rules and principles for speaking and writing a natural language.

Grammar may also refer to:

• Grammar, a linguistic description of the morphology and syntax of a natural language
• Grammar book, a book describing the grammar of one or more languages
• Formal grammar, in mathematics, logic, and theoretical computer science a set of production rules for character strings in a constructed formal language (e.g., a programming language)
• Prescriptive grammar, a style guide laying down norms and guidelines for writing and speaking a natural language