"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.