Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Skill or knowledge in a particular area. synonym: skill.

from The Century Dictionary.

  • noun An examination by experts; a survey by a board of skilled examiners of any obscure or doubtful ease in order to establish a foundation upon which the court may base an intelligent and definite judgment.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun great skill or knowledge in a particular field or hobby
  • noun advice, or opinion, of an expert

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun skillfulness by virtue of possessing special knowledge

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[French, expert opinion, expert appraisal, from expert, experienced; see expert.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Borrowing from French expertise

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