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Property of items within the grammar of a language

In linguistics, a grammatical category or grammatical feature is a property of items within the grammar of a language. Within each category there are two or more possible values (sometimes called grammemes), which are normally mutually exclusive. Frequently encountered grammatical categories include:
Case, varying according to function. Gender, with values like Male, Female, Animate, Inanimate, Neuter, and more general classes. Number, varying according to the number of things. Tense, varying according to when an action takes place in, whether in the present, past or future. Aspect, varying according to how much time an action will take, whether finished, repeated or habitual. Mood, varying according to modality, or the speaker's attitude towards the action. Although the use of terms varies from author to author, a distinction should be made between grammatical categories and lexical categories. Lexical categories (considered syntactic categories) largely correspond to the parts of speech of traditional grammar, and refer to nouns, adjectives, etc. A phonological manifestation of a category value (for example, a word ending that marks "number" on a noun) is sometimes called an exponent. Grammatical relations define relationships between words and phrases with certain parts of speech, depending on their position in the syntactic tree. Traditional relations include subject, object, and indirect object.

A given constituent of an expression can normally take only one value in each category. For example, a noun or noun phrase cannot be both singular and plural, since these are both values of the "number" category. It can, however, be both plural and feminine, since these represent different categories (number and gender). Categories may be described and named with regard to the type of meanings that they are used to express. For example, the category of tense usually expresses the time of occurrence (e. g. past, present or future). However, purely grammatical features do not always correspond simply or consistently to elements of meaning, and different authors may take significantly different approaches in their terminology and analysis. For example, the meanings associated with the categories of tense, aspect and mood are often bound up in verb conjugation patterns that do not have separate grammatical elements corresponding to each of the three categories; see Tense–aspect–mood.

In traditional structural grammar, grammatical categories are semantic distinctions; this is reflected in a morphological or syntactic paradigm. But in generative grammar, which sees meaning as separate from grammar, they are categories that define the distribution of syntactic elements. For structuralists such as Roman Jakobson grammatical categories were lexemes that were based on binary oppositions of "a single feature of meaning that is equally present in all contexts of use". Another way to define a grammatical category is as a category that expresses meanings from a single conceptual domain, contrasts with other such categories, and is expressed through formally similar expressions. Another definition distinguishes grammatical categories from lexical categories, such that the elements in a grammatical category have a common grammatical meaning – that is, they are part of the language's grammatical structure.