expert

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Concise Oxford English Dictionary © 2008 Oxford University Press:
expert/ˈekspɜːt/
noun a person who is very knowledgeable about or skilful in a particular area. adjective having or involving specialized knowledge or skill.
– derivatives
expertly adverb,
expertness noun.
– origin ME (as adj.): from Fr., from L. expertus, past part. of experiri ‘try’; cf. experience and experiment.
'expert' also found in these Oxford entries:

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