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Latin word sto comes from Proto-Indo-European *sth₂-, and later Proto-Italic *staēō (Stand.)
*sth₂- (Proto-Indo-European)
*sth₂éh₁yeti (Proto-Indo-European)
*staēō (Proto-Italic)
Stand.
sto (Latin)
(Medieval Latin) I [currently] am (feel). (Medieval Latin) I am [located at]. I stand. I stay, remain.