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 consists of the morphemes ev-ler-i-n-i-z-de-n. 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.

Turkish is the most widely spoken of the Turkic languages, with around 90 to 100 million speakers. It is the national language of Turkey and Northern Cyprus. Significant smaller groups of Turkish speakers also exist in Germany, Austria, Bulgaria, North Macedonia, Greece, Cyprus, other parts of Europe, the South Caucasus, and some parts of Central Asia, Iraq, and Syria. Turkish is the 18th most spoken language in the world.