The Routledge Dictionary of Judaism
[1] Hebrew word for “order,” referring particularly to the order of the Passover Seder, the banquet held in Jewish homes on the eve of PASSOVER, celebrating the Exodus of Israel from Egyptian bondage in the time of the Pharaohs under the leadership of Moses. The Passover Seder is celebrated through the use of certain symbols and the explanation of their meaning. In addition, the narrative of Israel in Egypt and Psalms of thanksgiving and praise are recited.
See PASSOVER; HAGGADAH.
[2] A term that designates a large topical division of the Halakhah of the Mishnah, Tosefta, or Talmuds, of which there

Seder Some of the symbols of the Passover Seder: three loaves of matzah, four cups of wine, the cup set aside for Elijah, harbinger of the Messiah, and, in the center, the Passover HAGGADAH which contains the liturgy of the Seder.
are six: Zeraim, Moed, Nashim, Neziqin, Qodoshim, and Tohorot. See MISHNAH.
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