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Vine's Expository Dictionary of NT Words
properly, "a making straight" (dia, "through," orthos, "straight;" cp. diorthoma in Acts 24:2; see CORRECTION , No. 1), denotes a "reformation" or reforming, Hebrews 9:10; the word has the meaning either (a) of a right arrangement, right ordering, or, more usually, (b) of restoration, amendment, bringing right again; what is here indicated is a time when the imperfect, the inadequate, would be superseded by a better order of things, and hence the meaning (a) seems to be the right one; it is thus to be distinguished from that of Acts 24:2 , mentioned above. The word is used in the papyri in the other sense of the rectification of things, whether by payments or manner of life.
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Vines, W. E., M. A. Entry for 'Reformation'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/r/reformation.html. 1940.