Chorasmia (Old Persian Uvarazmiya) was a satrapy of the Achaemenid Empire. Chorasmia had become part of the Achaemenid Empire before 522, and it seems to have been ruled by the satrap of Parthia.
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Chorasmia:
From Latin Chorasmia, from Chorasmii ?(“Chorasmians”), from Ancient Greek Χορ?σμιοι ?(Khorásmioi, “Chorasmians”).