From Citizendium, the Citizens' Compendium
- Grammar (linguistics) : The structural rules that govern the composition of sentences, phrases, and words in any language; alternatively, the system of language itself, i.e. the principles common to all languages.
- Linguistic prescriptivism : The laying down or prescribing of normative rules for the use of a language, or the making of recommendations for effective language usage.
- English grammar : The body of rules describing the properties of the English language.
- Grammar and spell checker : A program, or part of a program, that attempts to verify written text for grammatical correctness and misspelled words.