Agglutinative language
An agglutinative language is a type of synthetic language with morphology that primarily uses agglutination. In an agglutinative language, words contain multiple morphemes concatenated together, but in such a manner that individual word stems and affixes can be isolated and identified as to indicate a particular inflection or derivation, although this is not a rule: for example, Finnish is a typical agglutinative language, but morphemes are subject to (sometimes unpredictable) consonant alternations called consonant gradation.
Despite the occasional outliers, agglutinative languages tend to have more easily deducible word meanings compared to fusional languages, which allow unpredictable modifications in either or both the phonetics or spelling of one or more morphemes within a word, usually resulting from a shortening of the word or to make pronunciation easier.
Many unrelated languages spoken by Ancient Near East peoples were agglutinative, though none from larger families have been identified:
Some well known constructed languages are agglutinative, such as Black Speech,[6] Esperanto, Klingon, and Quenya.
Agglutination is a typological feature and does not imply a linguistic relation, but there are some families of agglutinative languages. For example, the Proto-Uralic language, the ancestor of the Uralic languages, was agglutinative, and most descendant languages inherit this feature. But since agglutination can arise in languages that previously had a non-agglutinative typology, and it can be lost in languages that previously were agglutinative, agglutination as a typological trait cannot be used as evidence of a genetic relationship to other agglutinative languages. The uncertain theory about Ural-Altaic proffers that there is a genetic relationship with this proto-language as seen in Finnish, Mongolian and Turkish.[7]
Many languages have developed agglutination. This developmental phenomenon is known as language drift, such as Indonesian. There seems to exist a preferred evolutionary direction from agglutinative synthetic languages to fusional synthetic languages, and then to non-synthetic languages, which in their turn evolve into isolating languages and from there again into agglutinative synthetic languages. However, this is just a trend, and in itself a combination of the trend observable in grammaticalization theory and that of general linguistic attrition, especially word-final apocope and elision.