Grammar - An agreed upon set of rules or principles that guides in the written and phonetic usage of a language. Grammatical correctness varies distinctly across cultures and dialects. Grammar also tends to evolve over time, due to the ever-changing nature of language itself. A formally accepted fact of grammar might find itself irrelevant or outmoded in the future. Grammar can be used as a tool or compliment to a writer's work; conversely, strict adherence to grammar may become a detriment, stilting what might have been fluid prose. Grammar's prominence in a written work may vary, depending on whether or not one is writing fiction or a work for academic purposes. Grammar: an agreed upon set of rules and guidelines within a language system which allows the users to communicate and express ideas in a uniform manner in order to better understand one another. A set of mutable guidelines for the use of language, that emerges when a culture hits a specific level, that changes as usage does over time and is dependent on location. Grammar is an ever-evolving system of communication that organizes language according to morphology, the form and structure of words, and syntax, the arrangement of phrases and sentences. Just as the word grammar is the result of a union between English, Old French, Latin, and Greek, the grammar of individual languages results from the convergence of cultures over time and provides insight into history. Grammar is an ever-evolving system of communication that organizes language according to morphology, the form and structure of words, and syntax, the arrangement of phrases and sentences. Just as the word grammar is the result of a union between English, Old French, Latin, and Greek, the grammar of individual languages results from the convergence of cultures over time and provides insight into history.