November (from Latin novem, "nine") or mensis November was originally the ninth of ten months on the Roman calendar, following October (octo, "eight") and preceding December (decem, "ten"). It had 29 days. In the reform that resulted in a 12-month year, November became the eleventh month, but retained its name, as did the other months from September through December. A day was added to November during the Julian calendar reform in the mid-40s BC.