from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The cardinal number equal to 9 × 10.
- n. A decade or the numbers from 90 to 99: My grandparents are in their nineties. During the heat wave, the temperature stayed in the nineties.
- n. The decade from 90 to 99 in a century.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90.
from the GNU version of the Collaborative International Dictionary of English
- adj. Nine times ten; eighty-nine and one more.
- n. The sum of nine times ten; the number greater by a unit than eighty-nine; ninety units or objects.
- n. A symbol representing ninety units, as 90 or xc.
from The Century Dictionary and Cyclopedia
- Nine times ten; one more than eighty-nine, or ten less than a hundred: a cardinal numeral.
- n. The sum of ten nines, or nine tens; nine times ten.
- n. A symbol representing ninety units, as 90, or XC, or xc.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. being ten more than eighty
- n. the cardinal number that is the product of ten and nine
Middle English ninti, from Old English nigontig; see newn̥ in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)