EXPERT definition: a person who has special skill or knowledge in some particular field; specialist; authority. 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 study.
Some common synonyms of expert are adept, proficient, skilled, and skillful. While all these words mean "having great knowledge and experience in a trade or profession," expert implies extraordinary proficiency and often connotes knowledge as well as technical skill.
An expert is someone who knows a ton about the subject at hand. The adjective form of expert describes someone or something that has that special knowledge. If you get expert instruction, that means an expert is your teacher.
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.
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2. possessing special skill or knowledge. 3. pertaining to or characteristic of an expert: expert advice.