Definitions

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

  • noun The cardinal number equal to 2 × 10.
  • noun A decade or the numbers from 20 to 29.
  • noun The decade from 20 to 29 in a century.
  • noun A twenty-dollar bill.

from The Century Dictionary.

  • One more than nineteen; twice ten: a cardinal numeral.
  • Proverbially, an indefinite number: sometimes duplicated.
  • noun The number which is one more than nineteen; twice ten; a score.
  • noun A symbol rep resenting this number, as 20, XX, or xx.
  • noun An old division of English infantry (see thousand and hundred). The commander of a twenty was called vintiner.

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

  • adjective One more than nineteen; twice ten.
  • adjective An indefinite number more or less that twenty.
  • noun The number next following nineteen; the sum of twelve and eight, or twice ten; twenty units or objects; a score.
  • noun A symbol representing twenty units, as 20, or xx.

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

  • noun The cardinal number 20, occurring after nineteen and before twenty-one.
  • noun colloquial A banknote with a denomination of 20.
  • noun 10-20 (location).
  • noun military A set of twenty push-ups.

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

  • adjective denoting a quantity consisting of 20 items or units
  • noun the cardinal number that is the sum of nineteen and one
  • noun a United States bill worth 20 dollars

Etymologies

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

[Middle English, from Old English twēntig; see dwo- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English, from Old English twentiġ, from Proto-Germanic *twaintigaz, *twai tigiwiz, an old compound of *twain-/*twai (see two) and *-tigaz/*teguz. Compare West Frisian tweintich, Dutch twintig, German zwanzig, Danish tyve.

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