Fusional languages or inflected languages are a type of synthetic languages, distinguished from agglutinative languages by their tendency to use a single morpheme to denote multiple grammatical, syntactic, or semantic changes. For example, the Spanish language verb comer ("to eat") can be expressed in first-person past preterite tense as comí, a word formed removing the "-er" suffix of the verb and replacing it by "-í", that indicate such specific meaning.
Examples of fusional Indo-European languages are: Sanskrit, Pashto, Punjabi, Hindustani, Greek (classical and modern), Latin, Italian, French and the Iberian Romance dialect continuum, Irish, Lithuanian, Latvian, German, Faroese, Icelandic, Russian, Polish, Slovak, Czech, Serbian, Slovenian, Croatian, Bosnian and Albanian. Another notable group of fusional languages is the Semitic languages group. A high degree of fusion is also found in many Sami languages, such as Skolt Sami. Unusually for a natively North American language, Navajo is sometimes described as fusional due to its complex and inseparable verb morphology.
An illustration of fusionality is the Latin word bonus ("good"). The ending -us denotes masculine gender, nominative case, and singular number. Changing any one of these features requires replacing the suffix -us with a different one. In the form bonum, the ending -um denotes masculine accusative singular, neuter accusative singular, or neuter nominative singular.
Fusional languages generally tend to lose their inflection over the centuries—some languages much more quickly than others. While Proto-Indo-European was fusional, some of its descendants have shifted to a more analytic structure, such as Modern English and Afrikaans, or agglutinative, such as Persian and Armenian. Other descendants are fusional, including Sanskrit, Ancient Greek, Lithuanian, Latvian, Slavic languages, as well as Latin and the Romance languages and certain Germanic languages.
Some languages shift over time from agglutinative to fusional. For example, while most Uralic languages are predominantly agglutinative, Estonian is markedly evolving in the direction of a fusional language. On the other hand, Finnish, its close relative, exhibits fewer fusional traits, thereby keeping closer to the mainstream Uralic type.
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One feature of many fusional languages is their systems of declensions. Here nouns and adjectives have a suffix attached to them to specify grammatical case (their uses in the clause), number, and grammatical gender; pronouns may alter their forms entirely to encode this information. In most Romance languages, encoding for case is merely vestigial; this is because it no longer encompasses nouns and adjectives, but only pronouns. Compare the Italian egli (masculine singular nominative), gli (masculine singular dative, or indirect object), lo (masculine singular accusative) and lui (also masculine singular accusative, but emphatic and indirect case to be used with prepositions), corresponding to the single vestigial pair he, him in English.
Conjugation is the alteration of the form of a verb to encode information about some or all of grammatical mood, voice, tense, aspect, person, grammatical gender, and number. In a fusional language, two or more of these pieces of information may be conveyed in a single morpheme, typically a suffix.
For example, in French, the verbal suffix depends on the mood, tense, and aspect of the verb, as well as on the person and number (but not the gender) of its subject. This gives rise to typically forty-five different single-word forms of the verb, each conveying some or all of a mood (one of indicative, subjunctive, conditional, or imperative), a tense (past, present or future), an aspect (perfective or imperfective), and a person and a number (first, second, or third person singular or plural). To change any one of these pieces of information without changing the others requires using a different suffix, the key characteristic of fusionality.
English has two examples of conjugational fusion. The verbal suffix -s indicates a combination of present tense with both third person and singularity of the associated subject. And the verbal suffix -ed, used in a verb with no auxiliary verb, conveys both non-progressive aspect and past tense.
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