expert

An expert is someone who has advanced knowledge or skill in a particular area. (noun)

When it comes to the subject of history, a history teacher is an example of an expert.

Expert describes someone who is very skillful or has advanced training and knowledge in a particular area or field. (adjective)

An example of someone who would be described as an expert is an Olympic athlete, who could be described as an expert in his or her sport.

See expert in Webster's New World College Dictionary

See expert in American Heritage Dictionary 4

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