"9 times ten; the number which is one more than eighty-nine or 10 less than one hundred; a symbol representing this number;" Middle English nīntī (late 13c.), from Old English nigontig, from nine + -tig "group of ten" (see -ty (1)). Cognate with Old Frisian niontich, Middle Dutch negentich, Dutch negentig, German neunzig, Old Norse nintigir.
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