expert

/ˈek-ˌspərt/

borrowed from French, going back to Middle French, derivative of expert

noun

  1. one with the special skill or knowledge representing mastery of a particular subject

adjective

  1. having, involving, or displaying special skill or knowledge derived from training or experience

  2. experienced

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. adept implies special aptitude as well as proficiency.

verb

  1. to serve as an expert