Morphological typology

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Morphological typology is a way of classifying the languages of the world (see linguistic typology) that groups languages according to their common morphological structures. The field organizes languages on the basis of how those languages form words by combining morphemes. Analytic languages contain very little inflection, instead relying on features like word order and auxiliary words to convey meaning. Synthetic languages, ones that are not analytic, are divided into two categories: agglutinative and fusional languages. Agglutinative languages rely primarily on discrete particles (prefixes, suffixes, and infixes) for inflection, while fusional languages "fuse" inflectional categories together, often allowing one word ending to contain several categories, such that the original root can be difficult to extract. A further subcategory of agglutinative languages are polysynthetic languages, which take agglutination to a higher level by constructing entire sentences, including nouns, as one word.

Analytic, fusional, and agglutinative languages can all be found in many regions of the world. However, each category is dominant in some families and regions and essentially nonexistent in others. Analytic languages encompass the Sino-Tibetan family, including Chinese, many languages in Southeast Asia, the Pacific, and West Africa, and a few of the Germanic languages. Fusional languages encompass most of the Indo-European family—for example, French, Russian, and Hindi—as well as the Semitic family and a few members of the Uralic family. Most of the world's languages, however, are agglutinative, including the Turkic, Japonic, Dravidian, and Bantu languages and most families in the Americas, Australia, the Caucasus, and non-Slavic Russia. Constructed languages take a variety of morphological alignments.

The concept of discrete morphological categories has been criticized. Some linguists argue that most, if not all, languages are in a permanent state of transition, normally from fusional to analytic to agglutinative to fusional again. Others take issue with the definitions of the categories, arguing that they conflate several distinct, if related, variables.