The 14th of Adar, observed in celebration of the deliverance of the Jews from massacre by Haman.
A Jewish holiday, the Feast of Lots, celebrated on the 14th day of Adar, commemorating the deliverance of the Jews by Esther from a general massacre plotted by Haman: Esth. 9:21
Origin of purim
Hebrew pûrîm pl. of pûr lot (from the lots Haman cast to decide the day of the massacre, Esther 9:24–26) from Akkadian pūru lot