Definition of Seder noun from the Oxford Advanced Learner's Dictionary

 

Seder

 noun
noun
BrE BrE//ˈseɪdə(r)//
 
; NAmE NAmE//ˈseɪdər//
 
Religious ceremonies
 
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a Jewish ceremonial service and dinner on the first night or first two nights of Passover See related entries: Religious ceremonies Word Originfrom Hebrew sēd̲er ‘order, procedure’.
See the Oxford Advanced American Dictionary entry: Seder