-teen
-teen combining form meaning "ten more than," from O.E. -tene, -tiene, from P.Gmc. *tekhuniz (Cf. O.S. -tein, Du. -tien, O.H.G. -zehan, Ger. -zehn, Goth. -taihun), an inflected form of the root of TEN (Cf. ten); cognate with L. -decim (Cf. It. -dici, Sp. -ce, Fr. -ze). The combining form of ordinal numbers, -teenth, developed from O.E. -teoða, -teoðe (W.Saxon), teogoða (Anglian) "tenth."

Etymology dictionary. 2014.

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