In Esther 8:9; 9:3 (RSV, "governor") it denotes a Persian prefect "on this side" i.e., in the region west of the Euphrates. It is the modern word Pasha .
In Acts 13:7,8,12; 18:12 , it denotes a proconsul; i.e., the governor of a Roman province holding his appointment from the senate. The Roman provinces were of two kinds, (1) senatorial and (2) imperial. The appointment of a governor to the former was in the hands of the senate, and he bore the title of proconsul (Gr. anthupatos). The appointment of a governor to the latter was in the hands of the emperor, and he bore the title of propraetor (Gr. antistrategos).
Easton's Bible Dictionary was written by Matthew George Easton, who lived from 1823-1894. This Scottish Presbyterian's other significant literary achievements were his English translations of two of Franz Delitzsch's commentaries. The nearly 4,000 entries cover material from Aaron to Zuzims!Wikipedia
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