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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. EXPERT definition: 1. a person with a high level of knowledge or skill relating to a particular subject or activity.. Learn more. EXPERT definition: a person who has special skill or knowledge in some particular field; specialist; authority. See examples of expert used in a sentence. 2. possessing special skill or knowledge. 3. pertaining to or characteristic of an expert: expert advice. 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.