From Middle English so, swo, zuo, swa, swe, from Old English swā, swǣ, swē, from Proto-West Germanic *swā, from Proto-Germanic *swa, *swē, from Proto-Indo-European *swé (reflexive pronomial stem). Cognate with Scots sae ("so"), West Frisian sa ("so"), Low German so ("so"), Dutch zo ("so"), German so ("so"), Danish så ("so"), Norwegian Nynorsk so, Swedish så ("so, such that"), Old Latin suad ("so"), Albanian sa ("how much, so, as"), Ancient Greek ὡς ("as"), Urdu سو ("hence")
Shortened from sol, to make it an open syllable for uniformity with the rest of the scale.
Borrowed from Japanese 蘇.
Modern English dictionary
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