expert
ex·pert (ĕkʹspûrt')n. 1. A person with a high degree of skill in or knowledge of a certain subject. 2. a. The highest grade that can be achieved in marksmanship. b. A person who has achieved this grade.adj. (ĕkʹspûrt, ĭk-spûrtʹ) Having, involving, or demonstrating great skill, dexterity, or knowledge as the result of experience or training. See Synonyms at proficient. [Middle English, from Old French, experienced, from Latin expertus, past participle of experīrī, to try. See per-3 in Indo-European Roots.] exʹpert'ly adv.exʹpert'ness n.
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