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

  • n. The ordinal number matching the number 12 in a series.
  • n. One of 12 equal parts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. The ordinal form of the number twelve, describing a person or thing in position number 12 of a sequence.
  • n. One of twelve equal parts of a whole.
  • n. An interval equal to an octave plus a fifth

from the GNU version of the Collaborative International Dictionary of English

  • adj. Next in order after the eleventh; coming after eleven others; -- the ordinal of twelve.
  • adj. Constituting, or being one of, twelve equal parts into which anything is divided.
  • n. The quotient of a unit divided by twelve; one of twelve equal parts of one whole.
  • n. The next in order after the eleventh.
  • n. An interval comprising an octave and a fifth.

from The Century Dictionary and Cyclopedia

  • Next in order after the eleventh: an ordinal numeral.
  • Being one of twelve equal parts into which a whole is regarded as divided.
  • n. One of twelve equal parts of anything; the quotient of unity divided by twelve.
  • n. In early English law, a twelfth of the rents of the year, or of movables, or both, granted or levied by way of tax.
  • n. In music, a tone twelve diatonic degrees above or below a given tone, or the interval between two such tones; a compound fifth.
  • n. In organ-building, a stop giving tones a twelfth above the normal pitch of the digitals used.
  • n. Twelfth-day.

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

  • adj. coming next after the eleventh and just before the thirteenth in position
  • n. one part in twelve equal parts
  • n. position 12 in a countable series of things


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

Middle English twelfthe, alteration of Old English twelfta; see dwo- in Indo-European roots.



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  • See the conversation at texts.

    March 30, 2009

  • It's three consonant sounds: /l/, /f/, and /th/; another ordinal with three consonant sounds is sixth: /k/, /s/, and /th/.

    March 30, 2009

  • This word is awesome because it at least three consonant sounds in a row. Or is it four? I think the most you can have in a row in the English language is four.

    March 30, 2009

  • Great word! I'm trying to decide which I like better, this or eighth. Fifth gets honorable mention.

    January 16, 2007