Adept, n.
Etymology: [L. adeptus obtained (sc. artem), adipsci to arrive ad + apisci to pursue. See Apt, and cf. Adapt.]
One fully skilled or well versed in anything; a proficient; as, adepts in philosophy.
1 other Webster entry under this spelling
Adept, a.
Well skilled; completely versed; thoroughly proficient. Beaus adept in everything profound. Cowper.
Shades of meaning
Fernald has no entry of its own for adept; he lists it under skilful.
Where he writes about it:
One is adept in that for which he has a natural gift improved by practise; he is expert in that of which training, experience, and study have given him a thorough mastery; he is dexterous in that which he can do effectively, with or without training, especially in work of the hand or bodily activities. — from skilful