The story
- Latin · derived fromundecim“eleven”
- English todayUndecimber
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 is unclear whether the term was ever used in Classic Latin as a name for an intercalary month.
Words from the same roots
Latinundecim all →
undeca-undecetundecimarticulate
Etymology from Wiktionary, CC BY-SA 4.0.