Vine's Expository Dictionary of NT Words
lit., "the (one) over the bedchamber" (epi, "over," koiton, "a bedchamber"), denotes "a chamberlain," an officer who had various duties in the houses of kings and nobles. The importance of the position is indicated by the fact that the people of Tyre and Sidon sought the favor of Herod Agrippa through the mediation of Blastus, Acts 12:20 .Note: In Romans 16:23 , oikonomos, "a person who manages the domestic affairs of a family, in general, a manager, a steward," is translated "chamberlain" in the AV, which the RV corrects to "treasurer."
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Vines, W. E., M. A. Entry for 'Chamberlain'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/c/chamberlain.html. 1940.