Pronunciation: (ken'tum, -toom),[key] —adj. belonging to or consisting of those branches of the Indo-European family of languages that show distinctive preservation of the Proto-Indo-European labiovelars and that show a historical development of velar articulations, as the sounds (k) or (kh), from Proto-Indo-European palatal phonemes. The centum branches are Germanic, Celtic, Italic, Hellenic, Anatolian, and Tocharian. Cf. satem.