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Sacrifice was the offering of food, objects or lives to a supernatural being.
In Nazi Germany during the 1930s, the Black Coven sacrificed an animal on occasion in Heinrich Himmler's castle of Drachensberg. The sacrifices served no purpose other than to maintain Himmler's favour, owing to his obsession with the occult. At the start of World War II, the Coven planned to offer Ace as their first human sacrifice before the Seventh Doctor and Hermann Goering disrupted the ritual. (PROSE: Timewyrm: Exodus)
On the planet P7E, sacrifices were carried out by the Seers. They involved a sword being placed over the victim and tied in place. The lamp of life was then lit and hoisted beneath the cloth. When it burnt through, the sword would fall and kill the sacrifice. Leela asked the Doctor why they went to such trouble and he told her that it was designed to intimidate. (TV: Underworld)
On Delta III, the Swampies offered the Doctor, Romana, and Rohm-Dutt as sacrifices to Kroll. The method chosen was the seventh of the Seven Holy Rituals. The three were tied with vines, called creepers, that would tighten under sunlight. The creepers would constrict, eventually snapping their spines. The Doctor broke a window, wetting the creepers in the rain causing them to loosen and allow escape. (TV: The Power of Kroll)