fourteenth adj., n.

"1 more than thirteen; the number which is one more than thirteen; a symbol representing this number;" c. 1300, from Old English feowertyne; see four + -teen. Compare Old Saxon fiertein, Old Frisian fiuwertine, Dutch veertien, Old High German fiorzehan, German vierzehn, Danish fjorten, Gothic fidwortaihun.

word-forming element making ordinal numbers (fourth, tenth, etc.), Old English -ða, from Proto-Germanic *-tha- (cognates: Gothic -da, -ta, Old High German -do, -to, Old Norse -di, -ti), from PIE *-to-, also *-eto-, *-oto-, suffix forming adjectives "marking the accomplishment of the notion of the base" [Watkins].

Cognate with Sanskrit thah, Greek -tos, Latin -tus; Sanskrit ta-, Lithuanian and Old Church Slavonic to, Greek to "the," Latin talis "such;" Greek tēlikos "so old, of such an age," Old Church Slavonic toli "so, to such a degree," toliku "so much," Russian toliko "only;" also see -ed.