Grammar definitions

grăm'ər
The study of structural relationships in language or in a language, sometimes including pronunciation, meaning, and linguistic history.
noun
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Writing or speech judged with regard to such a set of rules.
noun
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That part of the study of language which deals with the forms and structure of words (morphology), with their customary arrangement in phrases and sentences (syntax), and now often with language sounds (phonology) and word meanings (semantics)
noun
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The system of inflections, syntax, and word formation of a language.
noun
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A system of rules and principles for speaking and writing a language.
noun
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(UK) A grammar school.
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The basic principles of an area of knowledge.

The grammar of music.

noun
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The system of rules implicit in a language, viewed as a mechanism for generating all sentences possible in that language.
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A normative or prescriptive set of rules setting forth the current standard of usage for pedagogical or reference purposes.
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A book dealing with such principles.
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The system of a given language at a given time.
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One's manner of speaking or writing as judged by prescriptive grammatical rules.

His grammar was poor.

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The elementary principles of a field of knowledge.
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A book or treatise on these.
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(uncountable, linguistics) The study of the internal structure of words (morphology) and the use of words in the construction of phrases and sentences (syntax).
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A book describing the rules of grammar of a language.
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(computing theory) A formal system specifying the syntax of a language.
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(computing theory) A formal system defining a formal language.
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The basic rules or principles of a field of knowledge or a particular skill.
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(UK, archaic) A textbook.

A grammar of geography.

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(obsolete, intransitive) To discourse according to the rules of grammar; to use grammar.

verb
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The definition of grammar is the study of the way words are used to make sentences.

An example of grammar is how commas and semicolons are supposed to be used.

noun
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A book containing the morphologic, syntactic, and semantic rules for a specific language.
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The study of how words and their component parts combine to form sentences.
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A body of rules imposed on a given language for speaking and writing it, based on the study of its grammar or on some adaptation of another, esp. Latin, grammar.
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A book or treatise on grammar.
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Origin of grammar

From Middle English gramarye, gramery, from Old French gramaire (“classical learning”), from Latin grammatica, from Ancient Greek γραμματική (grammatike, “skilled in writing”), from γράμμα (gramma, “line of writing”), from γράφω (grapho, “write”), from Proto-Indo-European *gerebh- (“to scratch”).