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Definition of expert noun from the Oxford Advanced American Dictionary

    

expert

 noun
noun
NAmE//ˈɛkspərt//
 
 
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 a person with special knowledge, skill, or training in something a computer/medical expert expert (at/in/on something) an expert in child psychology an expert on modern literature expert (at/in/on doing something) He's an expert at getting his own way. Don't ask me—I'm no expert!
See the Oxford Advanced Learner's Dictionary entry: expert

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