This inquiry will be limited to an analysis of Turkic borrowings that have been attested in inscriptions found in Mongolia and southern Siberia in the period beginning around the year 700 A.D., as well as in Turkic-Uighur manuscripts, beginning around the year 900 A.D., conserved in northern Tarim (especially in the Turfan region) and in Dunhuang, which is a Chinese outpost on the main road of the silk trade. We will look only at borrowings that predate Islamization, a process that developed rapidly during the eleventh century and of which some borrowings are still part of the language of the Islamic Turkish world. Although most of our study will concentrate on pre-Islamic borrowings that were fully assimilated into written words, we will will also investigate some transcriptions of foreign terms that are mentioned in various manuscripts of a theological bent (most notably of Indian, Iranian, Chinese, and Syriac origin and found in Buddhist, Manichaean, and Nestorian Christian texts) as well as words of a very technical nature. We will also look at more contemporary terms that are derived from several major semantic fields.