Definition of grammars:
(n) :
(countable and uncountable, linguistics) A system of rules and principles for the structure of a language, or of languages in general.
(n) :
(uncountable, linguistics) The study of such a system.
(n) :
(uncountable) Actual or presumed prescriptive notions about the correct use of a language.
(n) :
(countable) A book describing the grammar (noun, sense 1 or noun, sense 2) of a language.
(n) :
(countable, computing theory) A formal system specifying the syntax of a language.
(n) :
(countable, computing theory) A formal system defining a formal language.