Etymology
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nineteen (adj., n.)

"1 more than eighteen, nine more than ten; the cardinal number composed of 10 and 9; a symbol representing this number;" Middle English nīntene, from late Old English nigontene (Anglian), nigontyne (West Saxon); see nine + -teen. Cognate with Old Saxon nigentein, Old Frisian niogentena, Dutch negentien, Old High German niunzehan, German neunzehn, Old Norse nitjan, Danish nitten.

updated on June 24, 2019

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Definitions of nineteen from WordNet
1
nineteen (n.)
the cardinal number that is the sum of eighteen and one;
Synonyms: " / xix
2
nineteen (adj.)
being one more than eighteen;
Synonyms: " / xix
From wordnet.princeton.edu, not affiliated with etymonline.