Meaning

noun the syllable naming the fifth (dominant) note of any musical scale in solmization

adverb to a very great extent or degree

adverb in a manner that facilitates

originFrom Middle English so, swo, zuo, swa, swe, from Old English swā, swǣ, swē (“so, as, the same, such, that”), from Proto-West Germanic *swā, from Proto-Germanic *swa, *swē (“so”), from Proto-Indo-European *swē, *swō (reflexive pronomial stem). Cognate with Scots sae (“so”), Saterland Frisian so (“so”), West Frisian sa (“so”), Dutch zo (“so”), German Low German so (“so”), German so (“so”), Danish…

Etymology from Wiktionary, CC BY-SA 3.0