1. the rules for how words are used and combined in a language
2. the study of these language rules
3. a book that teaches the rules of a language

Examples

• She studied English grammar for her test.
• His grammar improved after taking the writing class.
• The teacher corrected the grammar mistakes in our essays.
• I need to buy a Spanish grammar book.
• Good grammar is important for clear communication.
• The grammar rules in this language are complex.
• We learned about verb tenses in grammar class.