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someone who has a prolonged or intense experience through practice and education in a particular field; person with considerable experience and/or reputation in a specific field
Three biblical wise old men, Cologne Cathedral.

An expert is an individual recognized as a reliable source of knowledge or skill in a particular field. An expert’s corresponding ability or expertise is, mostly, based on his/her credential, training, education, profession, publication or experience. Historically, an expert was referred to as a wise old man. Such individual was usually a profound intellectual distinguished for wisdom and sound judgment.[1]

Someone who is not an expert may be called a beginner or a novice if they are new to that field.

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