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: a person who has special skill or knowledge in some particular field; specialist; authority. See examples of expert used in a sentence.

EXPERT definition: 1. a person with a high level of knowledge or skill relating to a particular subject or activity…. Learn more.

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, …

Dec 24, 2025 · expert (comparative more expert, superlative most expert) Extraordinary capable or knowledgeable.

skillful or skilled (often fol. by in or at): an expert driver; to be expert at driving a car. pertaining to, coming from, or characteristic of an expert: expert work; expert advice.

GRAMMAR: Prepositions with expert • Someone is an expert on a subject or issue: He’s an expert on the Cold War. Don’t say: He’s an expert of the Cold War.

An expert witness, particularly in common law countries such as the United Kingdom, Australia, and the United States, is a person whose opinion by virtue of education, training, certification, …

EXPERT meaning: a person who has special skill or knowledge relating to a particular subject