sabbat

The Sabbath (or Sabbat) is a weekly day of rest and/or worship that is observed in the Judeo-Christian faiths. The term derives from the Hebrew shavat, "(to) rest". It originates from the biblical account of the last day of creation, and was repeated as part of the Ten Commandments. A number of other religions have a similar practice, and the term has also been imported into secular usage.
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Noun
1. a midnight meeting of witches to practice witchcraft and sorcery; in the Middle Ages it was supposed to be a demonic orgy
(synonym) witches' Sabbath
(hypernym) assembly

n. Sabbath, Saturday, seventh day of a week, day of rest and religious observance among Jews and some Christian sects; period of rest

n. Sabbath, Saturday, day of rest and religious observance among Jews and some Christian sects; Sunday, day of rest and religious observance for most Christians; period of rest

n. Sabbath, Saturday, day of rest and religious observance among Jews and some Christian sects; Sunday, day of rest and religious observance for most Christians