In linguistics, agglutination is a morphological process in which words are formed by stringing together morphemes, each of which corresponds to a single syntactic feature. Languages that use agglutination widely are called agglutinative languages. For example, in the agglutinative language of Turkish, the word evlerinizden ("from your houses") consists of the morphemes ev-ler-iniz-den, literally translated morpheme-by-morpheme as house-plural-your(plural)-from. Agglutinative languages are often contrasted with isolating languages, in which words are monomorphemic, and fusional languages, in which words can be complex, but morphemes may correspond to multiple features.
Agglutinative language
Although agglutination is characteristic of certain language families, this does not mean that when several languages in a certain geographic area are all agglutinative they are necessarily related phylogenetically. In the past, this assumption led linguists to propose the so-called Ural–Altaic language family, which included the Uralic and Turkic languages, as well as Mongolian, Korean, and Japanese. Contemporary linguistics views this proposal as controversial.
Another consideration when evaluating the above proposal is that some languages, which developed from agglutinative proto-languages, lost their agglutinative features. For example, contemporary Estonian has shifted towards the fusional type. (It has also lost other features typical of the Uralic families, such as vowel harmony.)
Examples of agglutinative languages include the Uralic languages, such as Finnish, Estonian, and Hungarian. These have highly agglutinated expressions in daily usage, and most words are bisyllabic or longer. Grammatical information expressed by adpositions in Western Indo-European languages is typically found in suffixes.
Hungarian uses extensive agglutination in almost every part of it. The suffixes follow each other in special order based on the role of the suffix, and many can be heaped, one upon the other, resulting in words conveying complex meanings in compacted forms.