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A person who has special skill or knowledge in some particular field; See examples of expert used in a sentence. An expert is somebody who has a broad and deep understanding and competence in terms of knowledge, skill and experience through practice and education in a particular field or area of … Proficient, adept, skilled, skillful, expert mean having great knowledge and experience in a trade or profession. Proficient implies a thorough competence derived from training and practice. A person with a high level of knowledge or skill relating to a particular subject or activity…. Pertaining to or characteristic of an expert: Possessing special skill or knowledge. If you get expert instruction, that means an expert is your teacher. The adjective form of expert describes someone or something that has that special knowledge. If you say that someone has expert hands or an expert eye, you mean that they are very skilful or experienced in using their hands or eyes for a particular purpose.