part of speech: noun

definition 1: the rules for forming the words and sentences of a language. Some of these rules have to be learned. Other rules are already in the head of a native speaker. For example, a native English speaker would not say, “I a cat bitten by was,” because the grammar does not make sense. When one learns a new language, most of the rules of its grammar have to be learned.

  • I found Latin grammar hard to master.

definition 2: the use of these language rules in speaking and writing.

  • She is smart but she uses bad grammar.