Definitions

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

  • noun The normally non-existent thirteenth month of the Western calendar.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin undecim ("eleven"); formed as logical continuation to December, which in its turn is derived from Latin decem ("ten"), as it was the tenth month in the Roman calendar. It's unclear whether the term was ever used in Classic Latin as a name for an intercalary month.

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