1520s, from Middle French dexterité (16c.), from Latin dexteritatem (nominative dexteritas) "readiness, skillfulness, prosperity," from dexter "skillful," also "right (hand)" (source of Old French destre, Spanish diestro, etc.), from PIE root *deks- "right, on the right hand," also "south." The Latin form is with the comparative suffix -ter, thus meaning etymologically "the better direction." Middle English dester meant "right hand," and in heraldry dexter means "on the right side."
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