"to confute powerfully," is an intensive form of elencho, "to convict" (dia, "through," kata, "down," both intensive), Acts 18:28 , implying that "he met the opposing arguments in turn (dia), and brought them down to the ground (kata)." It carries also the thought that he brought home moral blame to them.
With over 3,400 entries, this timeless classic is THE reference guide to New Testament Greek words for English readers. It explains the meaning of the original Greek with the added dimension of the context of the Greek word.Wikipedia
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