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Pleonasm, which stems via Late Latin from the Greek verb pleonazein ("to be excessive"), is a fancy word for "redundancy." It's related to our words "plus" and "plenty," and ultimately it goes back to the Greek word for "more," which is "pleōn." Pleonasm is commonly considered a fault of style, but it can also serve a useful function. "Extra" words can sometimes be helpful to a speaker or writer in getting a message across, adding emphasis, or simply adding an appealing sound and rhythm to a phrase - as, for example, with the pleonasm "I saw it with my own eyes!"
Origin of pleonasm
Late Latin pleonasmus, from Greek pleonasmos, from pleonazein to be excessive, from pleiōn, pleōn more — more at plus
First Known Use: 1610
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