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In linguistics, declension is the inflection of nouns, pronouns, adjectives, and articles to indicate number (at least singular and plural), case (nominative or subjective, genitive or possessive, etc.), and gender. A declension is also a group of nouns that follow a particular pattern of inflection.
Declension occurs in many of the world's languages, and features very prominently in many European languages. Old English was a highly inflected language, as befits its Indo-European and especially its Germanic linguistic ancestry, but its declensions greatly simplified as it evolved into Modern English.
In Modern English, nouns have distinct singular and plural forms; that is, they decline to reflect their grammatical number; consider the difference between book and books. In addition, a few English pronouns have distinct nominative (also called subjective) and oblique (or objective) forms; that is, they decline to reflect their relationship to a verb or preposition, or case. Consider the difference between he (subjective) and him (objective), as in "He saw it" and "It saw him"; similarly, consider who, which is subjective, and the objective whom. Further, these pronouns and a few others have distinct possessive forms, such as his and whose. By contrast, nouns have no distinct nominative and objective forms, the two being merged into a single plain case. For example, chair does not change form between "the chair is here" (subject) and "I saw the chair" (direct object). Possession is shown by the clitic -'s attached to a possessive noun phrase, rather than by declension of the noun itself.
Gender is at best only weakly grammaticalized in Modern English. While masculine, feminine, and neuter genders are recognized, nouns do not normally decline for gender, though some nouns, especially Latin words and personal names, exist in multiple forms corresponding to different genders: alumnus (masculine singular) and alumna (feminine singular); Andrew and Andrea, Paul and Paula, etc. Suffixes such as -ess, -ette, and -er can also derive overtly gendered versions of nouns, with marking for feminine being much more common than marking for masculine. Many nouns can actually function as members of two genders or even all three, and the gender classes of English nouns are usually determined by their agreement with pronouns, rather than marking on the nouns themselves.
Adjectives are rarely declined for any purpose. They can be declined for number when they are used as substitutes for nouns (as in, "I'll take the reds", meaning "I'll take the red ones" or as shorthand for "I'll take the red wines", for example). Also the demonstrative determiners this and that are declined for number, as these and those. Some adjectives borrowed from other languages are, or can be, declined for gender, at least in writing: blond (male) and blonde (female) or a bonie lad as compared to a bonnie lass. Adjectives are not declined for case in Modern English, though they were in Old English. The article is never regarded as declined in Modern English, although formally, the words that and possibly she correspond to forms of the predecessor of the (se m., þæt n., sēo f.) as it was declined in Old English.
- homo (nominative) "[the] man" [as a subject] (e.g., homo ibi stat the man is standing there)
- hominem (accusative) "[the] man" [as a direct object] (e.g., ad hominem toward the man, in the sense of argument directed personally; hominem vidi I saw the man)
- hominis (genitive) "of [the] man" [as a possessor] (e.g., nomen hominis est Claudius the man's name is Claudius)
- hominī (dative) "to [the] man" [as an indirect object] (e.g., homini donum dedi I gave a present to the man; homo homini lupus est Man is a wolf to man.)
- homine (ablative) "[the] man" [in various uses not covered by the above] (e.g., sum altior homine I am taller than the man).
There are two further noun cases in Latin, the vocative and the locative. The vocative case indicates that a person or thing is being addressed (e.g., O Tite, cur ancillam pugnas? O Titus, why do you fight the slave girl?). Though widely used, it differs in form from the nominative only in the masculine singular of the second declension (that is, never in the plural, never in the feminine or neuter, and never in any declension other than the second). The locative case is rare in classic Latin, and it is mostly absorbed in the ablative case.
Sanskrit has eight cases: nominative, vocative, accusative, genitive, dative, ablative, locative and instrumental. Some count vocative not as a separate case, despite it having a distinctive ending in the singular, but consider it as a different use of the nominative.
- agent (kartṛ, related to the nominative)
- patient (karman, related to the accusative)
- means (karaṇa, related to the instrumental)
- recipient (sampradāna, related to the dative)
- source (apādāna, related to the ablative)
- locus (adhikaraṇa, related to the locative)
- address (sambodhan, related to the vocative)
For example, consider the following sentence:
vṛkṣ-āt parṇ-aṁ bhūm-āu patati from the tree a leaf to the ground falls
Here leaf is the agent, tree is the source, and ground is the locus. The endings -aṁ, -at, -āu mark the cases associated with these meanings.
Declension in specific languages
- Arabic ʾIʿrab
- Basque declension
- Czech declension
- Dutch declension system
- Finnish language noun cases
- German declension
- Greek declension
- Icelandic declension
- Irish declension
- Latin declension
- Latvian declension
- Lithuanian declension
- Middle English declension
- Polish declension
- Russian declension
- Slovak declension
- Slovenian declension
- Ukrainian declension
Latin and Greek
- James Clackson (2007) Indo-European linguistics: an introduction, p.90
- Amba Kulkarni and Peter Scharf (eds), Sanskrit Computational Linguistics: First and Second International Symposia Rocquencourt, France, October 29-31, 2007 and Providence, RI, USA, May 15-17, 2008, Revised Selected Papers, Volume 5402 of Lecture notes in artificial intelligence, Springer, 2009, ISBN 3-642-00154-8, pp. 64–68.
- Pieter Cornelis Verhagen, Handbook of oriental studies: India. A history of Sanskrit grammatical literature in Tibet, Volume 2, BRILL, 2001, ISBN 90-04-11882-9, p. 281.
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- The Status of Morphological Case in the Icelandic Lexicon by Eiríkur Rögnvaldsson. Discussion of whether cases convey any inherent syntactic or semantic meaning.
- Optimal Case: The Distribution of Case in German and Icelandic by Dieter Wunderlich
- Lexicon of Linguistics: Declension
- Lexicon of Linguistics: Base, Stem, Root
- Lexicon of Linguistics: Defective Paradigm
- Lexicon of Linguistics: Strong Verb
- Lexicon of Linguistics: Inflection Phrase (IP), INFL, AGR, Tense
- Lexicon of Linguistics: Lexicalist Hypothesis
- classical Greek declension
- automatic declension in foreign languages (Polish, Russian, Slovak, Croatian and other)