Chabad Knowledge Base
the seventh day of the festival of Sukkot, considered to be the final day of the New Year's Divine "judgment" in which the year's fate is determined; in addition to the Four Kinds taken on the preceding days of Sukkot, an additional willow is taken on this day; it is customary to stay up all night on the eve of Hoshanah Rabbah and study Torah.
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Entry for 'Hoshanah Rabbah'. Chabad Knowledge Base. https://www.studylight.org/dictionaries/eng/ckb/h/hoshanah-rabbah.html. 2012.