A system of rules and principles for speaking and writing a language.
(uncountable, linguistics) The study of the internal structure of words (morphology) and the use of words in the construction of phrases and sentences (syntax).
A book describing the rules of Grammar of a language.
(computing theory) A formal system specifying the syntax of a language.
(computing theory) A formal system defining a formal language
(UK, archaic) a textbook.