winter solstice
From Longman Dictionary of Contemporary Englishwinter solsticeˌwinter ˈsolstice noun → the winter solsticeExamples from the Corpuswinter solstice• Since both CHANike and Christmas were originally winter solstice celebrations, they often coincide and compete.• A mild example of this from antiquity was the Roman Saturnalia at the time of the winter solstice.• The winter solstice was only three days away, and the urge to have a raucous good time among friends took hold.