Seder sedentation • sederunt · · · Info · Definitions · Characters · · Seder · · Text Latin · · Script 5 · · Length Definitions · · · (noun) (Judaism) the ceremonial dinner on the first night (or both nights) of Passover. Synonyms: Passover supper. · · Noun Definition 1 Characters · · S latin capital letter s U+0053 d latin small letter d U+0064 e latin small letter e U+0065 r latin small letter r U+0072