Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The cardinal number equal to 9 × 10.
  • noun A decade or the numbers from 90 to 99.
  • noun The decade from 90 to 99 in a century.

from The Century Dictionary.

  • Nine times ten; one more than eighty-nine, or ten less than a hundred: a cardinal numeral.
  • noun The sum of ten nines, or nine tens; nine times ten.
  • noun A symbol representing ninety units, as 90, or XC, or xc.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Nine times ten; eighty-nine and one more.
  • noun The sum of nine times ten; the number greater by a unit than eighty-nine; ninety units or objects.
  • noun A symbol representing ninety units, as 90 or xc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The cardinal number occurring after eighty-nine and before ninety-one, represented in Roman numerals as XC and in Arabic numerals as 90.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective being ten more than eighty
  • noun the cardinal number that is the product of ten and nine

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English ninti, from Old English nigontig; see newn̥ in Indo-European roots.]

Examples

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