Routledge Dictionary of Language and Linguistics
agglutinating language [Lat. agglutinare ‘to glue together’]
Classification type postulated by von Humboldt (1836) from a morphological point of view for languages that exhibit a tendency toward agglutination in word formation, as, for example, Turkish, Japanese, Finnish. In contrast 
analytic language ( also isolating language), inflectional language. also language typology
Reference
Von Humboldt, W. 1836. Über die Verschiedenheit des menschlichen Sprachbaus. Berlin.
(Repr. in W. Von Humboldt, Werke, ed. A.Flitner and K. Gields. Darmstadt, 1963. Vol. 3, 144–367.)
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