Twelfth can mean:

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

Look up twelfth in Wiktionary, the free dictionary.

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

• 12 (number)
• Eleventh
• Thirteenth

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