The period around Christmas; the Christmas season, Christmastime; specifically, Christmas itself.
(dated, or Germanic Neo-Paganism) The period of celebration of a pre-Christian festival associated with the (northern) winter solstice, later absorbed into the festival of Christmas (but sometimes recreated by modern neo-pagans).
The period of southern winter in the middle of the year, sometimes celebrated in the colder, snowy regions of Australia with allusions to Christmas, which originated as a marketing gimmick.