adverb, conjunction, preposition Archaic.
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Origin: before 950; Middle English; Old English siththa, dialectal variant of siththan, orig., sīth thām after that, subsequently to that, equivalent to sīth subsequently (akin to Gothic seithus, Old Norse sīth- late, German seit since) + thām, dative of demonstrative pronoun, i.e., “to that” (see the1); compare Old Norse sīthan sith
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