late 15c., from convict (v.). Slang shortening con is from 1893.
mid-14c., from Latin convictus, past participle of convincere "to 'overcome' in argument, to overcome decisively," from com-, intensive prefix (see com-), + vincere "to conquer" (from nasalized form of PIE root *weik- (3) "to fight, conquer"). Replaced Old English verb oferstælan. Related: Convicted; convicting.
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