Nineteen
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Old English nigontȳne .
wiktionary
From Middle English nynetene, nintene, from Old English niġontīene, niġontēne, from Proto-Germanic *newuntehun. Cognate with Dutch negentien, Low German negenteihn, Hunsrik neinzen, German neunzehn, Danish nitten.
Equivalent to nine + -teen
etymonline
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.
