the twelfth and last month of the year, having 31 days: abbrev. Dec. or D.
Origin of DecemberMiddle English and Old French Decembre from Classical Latin December from decem, ten (+ -ber from uncertain or unknown; perhaps ): so named as the tenth month of the ancient Roman year, which began with March
The 12th month of the year in the Gregorian calendar. calendar
Origin of DecemberMiddle English decembre from Old French from Latin December the tenth month of the Roman year probably from decemmembris from decem-mēnsris decem ten ; see dek&mlowring; in Indo-European roots. mēnsis month ; see menses .