December, Dec

the last (12th) month of the year

• Gregorian calendar month — a month in the Gregorian calendar

• New Year's Eve, December 31 — the last day of the year
• Christmas, Christmas Day, Xmas, Dec 25 — a Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland
• Christmas, Christmastide, Christmastime, Yule, Yuletide, Noel — period extending from Dec. 24 to Jan. 6
• mid-December — the middle part of December

• Gregorian calendar, New Style — the solar calendar now in general use, introduced by Pope Gregory XIII in 1582 AD to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752
• winter, wintertime — the coldest season of the year