Definition of opponent for English Language Learners. : 1  a person, team, group, etc., that is competing against another in a contest. : 2  a person, group, etc., that is against something (such as an action, law, or system) : someone or something that does not want something to exist, be done, etc.
On the Celtic calendar, the traditional first day of winter is 1 November (Samhain, the Celtic origin of Halloween); spring starts 1 February (Imbolc, the Celtic origin of Groundhog Day); summer begins 1 May (Beltane, the Celtic origin of May Day); the first day of autumn is 1 August (Celtic Lughnasadh).
Dec 21, 2014. Winter solstice, falling this year on Sunday, Dec. 21, marks the first day of winter in the Northern Hemisphere. More precisely, winter officially begins at 6:03 p.m. ET â the moment when the Northern Hemisphere is pointed at its furthest distance from the sun.