grammar

This term encompasses both the abstract internal logic of a language and the formal academic study of those rules. It carries a dual connotation: it can refer to the prescriptive standards of correctness taught in schools or the descriptive patterns of how people actually speak in real-world settings.

As a noun, it is typically used as an uncountable mass noun when referring to the system of rules. However, it becomes countable when referring to a specific textbook or a specific linguistic system among many, such as when comparing the grammars of different languages.