Etymology
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Seder (n.)

home ritual service and ceremonial dinner at the start of Passover, 1865, from Hebrew (Semitic) sedher "order, procedure," related to sedherah "row, rank."

updated on April 06, 2022

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Definitions of Seder from WordNet

Seder (n.)
(Judaism) the ceremonial dinner on the first night (or both nights) of Passover;
Synonyms: Passover supper
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.