The twelfth and last month of the year, containing thirty-one days. During this month occurs the winter solstice.
Fig.: With reference to the end of the year and to the winter season; as, the December of his life.
the last (12th) month of the year
December is the twelfth and last month of the year in the Gregorian Calendar and one of seven Gregorian months with the length of 31 days.