Bible:

• The Scroll of Esther (Megillat Esther), read on the Jewish holiday of Purim.
• Any of the Five Megillot, a group of books in Ketuvim, the third part of the Tanakh (Hebrew Bible).
• A less common usage refers to a Hebrew scroll on parchment containing other full books from Nevi'im or Ketuvim.

Rabbinic literature:

• Tractate Megillah in the Talmud.
• Megillat Taanit, a tannaitic document listing Jewish days of celebration.
• In talmudic jargon, any scroll.