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ex·pert

(ĕkspûrt′)

A person with a high degree of skill in or knowledge of a certain subject.

adj. (ĕkspûrt, ĭk-spûrt)

Having, involving, or demonstrating skill in or knowledge of a certain subject. See Synonyms at proficient.

[Middle English, from Old French, experienced, from Latin expertus, past participle of experīrī, to try; see per-³ in the Appendix of Indo-European roots.]

expert′ly adv.

expert′ness n.

Indo-European & Semitic Roots Appendices

Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:

Indo-European Roots

Semitic Roots

The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.

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