Definitions from Wiktionary (grammar)

▸ noun:  (linguistics) A system of rules and principles for the structure of a language, or of languages in general.
▸ noun:  (linguistics) The study of such a system.
▸ noun:  Actual or presumed prescriptive notions about the correct use of a language.
▸ noun:  A book describing the grammar (sense 1 or sense 2) of a language.
▸ noun:  (computing theory) A formal system specifying the syntax of a language.
▸ noun:  (computing theory) A formal system defining a formal language.
▸ noun:  (figurative) The basic rules or principles of a field of knowledge or a particular skill.
▸ noun:  (British, archaic) A book describing these rules or principles; a textbook.
▸ noun:  (British) A grammar school.
▸ noun:  (cellular automata) A set of component patterns, along with the rules for connecting them, which can be combined to form more complex patterns such as large still lifes, oscillators, and spaceships.
▸ verb:  (obsolete, intransitive) To discourse according to the rules of grammar; to use grammar.

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