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Look up twelfth in resource, the free dictionary.

Twelfth can mean:

  • The Twelfth Amendment to the United States Constitution
  • The Twelfth, a Protestant celebration originating in Ireland

In mathematics:

  • 12th, an ordinal number; as in the item in an order twelve places from the beginning, following the eleventh and preceding the thirteenth
  • 1/12, a vulgar fraction, one part of a unit divided equally into twelve parts


  • The note twelve scale degrees from the root (current note, in a chord)
    • The interval (music) (that is, gap) between the root and the twelfth note: a compound fifth


  • Uncia (coin), a Roman coin worth 12th of an As

See also[]

  • 12 (number)
  • Eleventh
  • Thirteenth
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