adjective.
Having or showing skill; expert. synonym: proficient.
adjective.
Requiring specialized ability or training.
The Century Dictionary and Cyclopedia
Having skill; especially, having the knowledge and ability which come from experience; trained; versed; expert; adept; proficient.
Displaying or requiring skill; involving special knowledge or training: as, skilled labor.
the GNU version of the Collaborative International Dictionary of English
adjective.
Having familiar knowledge united with readiness and dexterity in its application; familiarly acquainted with; expert; skillful; -- often followed by in.