(1):
(v. i.) To hold a wassail; to carouse.
(2):
(n.) An occasion on which such good wishes are expressed in drinking; a drinking bout; a carouse.
(3):
(n.) The liquor used for a wassail; esp., a beverage formerly much used in England at Christmas and other festivals, made of ale (or wine) flavored with spices, sugar, toast, roasted apples, etc.; - called also lamb's wool.
(4):
(n.) A festive or drinking song or glee.
(5):
(a.) Of or pertaining to wassail, or to a wassail; convivial; as, a wassail bowl.
(6):
(n.) An ancient expression of good wishes on a festive occasion, especially in drinking to some one.