Etymology
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Seder (n.)

home service on the first nights of Passover, 1865, from Hebrew sedher "order, procedure," related to sedherah "row, rank."

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Definitions of Seder

Seder (n.)
(Judaism) the ceremonial dinner on the first night (or both nights) of Passover;
Synonyms: Passover supper
From wordnet.princeton.edu