Definitions

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

  • noun The cardinal number equal to 6 × 10.
  • noun A decade or the numbers from 60 to 69.
  • noun The decade from 60 to 69 in a century.

from The Century Dictionary.

  • Being the product of six and ten; being the sum of fifty and ten: a cardinal numeral.
  • noun The product of six and ten; the sum of fifty and ten.
  • noun A symbol representing sixty units, as 60, LX, lx.

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

  • adjective Six times ten; fifty-nine and one more; threescore.
  • noun The sum of six times ten; sixty units or objects.
  • noun A symbol representing sixty units, as 60, lx., or LX.

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

  • noun The cardinal number occurring after fifty-nine and before sixty-one, represented in Roman numerals as LX and in Arabic numerals as 60.

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

  • noun the cardinal number that is the product of ten and six
  • adjective being ten more than fifty

Etymologies

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

[Middle English, from Old English sixtig; see s(w)eks in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Old English sixtiġ.

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