Noun. Early 16th century.
[French dextérité from Latin dexteritas; also Greek dexios.]
1 Mental adroitness or skill, cleverness. E16
2 Manual or manipulative skill or adroitness; good physical coordination. M16
3 A skilful, adroit, or clever act. Usually in plural. L16
4 Right-handedness, the using of the right hand. rare. L19
It's fitting that the word adroit, previously covered in Lexicolatry, should be used so liberally in the definition of dexterity, as it too reflects the odd linguistic prejudices that left is bad and right is good. Right is also more skilful and dexterous, while left is awkward, clumsy and cack-handed. And yes, I say cack-handed intentionally, because that's exactly what cack-handed means.
Oh dear. Lefts. Rights. Can't we just all get along?