1560s, from convert (v.). Earlier was convers (early 14c.).
c. 1300, from Old French convertir, from Vulgar Latin *convertire, from Latin convertere "turn around, transform," from com "with, together" (see com-) + vertere "to turn" (from PIE root *wer- (2) "to turn, bend"). Originally in the religious sense. The Latin word is glossed in Old English by gecyrren, from cierran "to turn, return." Related: Converted; converting.
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