• Noun
  • a person who has special skill or knowledge relating to a particular subject
    1. a computer expert
    2. She was an acknowledged expert on/in child development.
    3. an expert at planning dinner parties
  • having or showing special skill or knowledge because of what you have been taught or what you have experienced
    1. We received some expert advice.
    2. an expert poker player
    3. an expert opinion
    4. The company has become expert at/in adapting its products for new clients.
    5. expert testimony
    6. an expert witness [=a witness in a court of law who is an expert on a particular subject]