mis'-tres (ba`alah, gebhereth):

Is the translation of ba`alah, "lady," "owner" (1 Kings 17:17; Nahum 3:4); in 1 Samuel 28:7, "a woman that hath a familiar spirit" is literally, "the mistress of a familiar spirit"; of gebhereth (Genesis 16:4,8,9; 2 Kings 5:3; Psalms 123:2; Proverbs 30:23; Isaiah 24:2); in Isaiah 47:5,7, we have the King James Version and the English Revised Version "lady," the American Standard Revised Version "mistress."

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'MISTRESS'". "International Standard Bible Encyclopedia". 1915.