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A person with a high degree of skill in or knowledge of a certain subject.
(noun)
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The highest grade that can be achieved in marksmanship.
(noun)
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A person who has achieved this grade.
(noun)
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Having, involving, or demonstrating great skill, dexterity, or knowledge as the result of experience or training. See Synonyms at proficient.
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.