The book examines partial interfixed reduplications in the standard Turkic languages. Generally no longer productive, this type of reduplication served primarily to intensify adjectives and adverbs. The reduplicated anlaut was prepended to the the base, and a lexically determined consonant inserted in between, e.g. Tksh. kara ‘black’ → ka.p.kara ‘jet-black’, Trkm. gūry ‘dry’ → gu.s.gūry ‘completely dry’. Unlike most previous works, this book considers the phenomenon comparatively across twenty modern languages, is based on possibly complete collections of examples, and approaches the subject from a diachronic perspective, combining etymological, historical-comparative, and quantitative methodology.