agglutinative language
Linguistics term for languages that form words by stringing together morphemes, each carrying a single grammatical function, such as Japanese, Korean, or Turkish.
Japanese is often classified as an agglutinative language.
In agglutinative languages, affixes are attached one after another to the stem.
A fusional/inflectional language, where a single affix may carry multiple grammatical meanings and morpheme boundaries are less clear (e.g., Latin, Russian).
From 膠着 (こうちゃく, 'adhesion, agglutination') + 語 (ご, 'language'). The term is a calque from Western linguistic terminology.