What does "expert" mean?

Expert: An expert or experienced person; one instructed by experience; one who has skill, experience, or extensive knowledge in his calling or in any special branch of learning.

Additional senses

2.(Law) (a) A specialist in a particular profession or department of science requiring for its mastery peculiar culture and erudition. Note: Such specialists may be witnesses in matters as to which ordinary observers could not without such aid form just conclusions, and are liable for negligence in case they injure another from want of proper qualifications or proper care in the exercise of their specialty. (b) A sworn appraiser.
3.To experience. [Obs.] Die would we daily, once it to expert. Spencer.

Sources

Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00