Agglutinative language

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An agglutinative language is a type of language that primarily forms words by stringing together morphemes (word parts)—each typically representing a single grammatical meaning—without significant modification to their forms (agglutinations). In such languages, affixes (prefixes, suffixes, infixes, or circumfixes) are added to a root word in a linear and systematic way, creating complex words that encode detailed grammatical information. This structure allows for a high degree of transparency, as the boundaries between morphemes are usually clear and their meanings consistent.

Agglutinative languages are a subset of synthetic languages. Within this category, they are distinguished from fusional languages, where morphemes often blend or change form to express multiple grammatical functions, and from polysynthetic languages, which can combine numerous morphemes into single words with complex meanings. Examples of agglutinative languages include Turkish, Finnish, Japanese, Korean, and Swahili.

Despite 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 morphology of one or more morphemes within a word.