Etimology
From Old French, from Latin expertus, from ex (“out”) + peritus (“experienced, expert”), perfect active participle of the unattested verb *perior (“I go through”), itself from Proto-Indo-European Proto-Indo-European *per-.
adjective
expert (comparative more expert, superlative most expert)
Extraordinarily capable or knowledgeable.
Characteristic of an expert.
(obsolete) Proven, experienced, veteran.
Examples
I am expert at making a simple situation complex.
My cousin is an expert pianist.
This problem requires expert knowledge.
Related words
synonyms
See also Thesaurus:skillful
antonyms
inexpert
nonexpert
noun
expert (plural experts)
A person with extensive knowledge or ability in a given subject.
(chess) A player ranking just below master.
Examples
If an expert says it can't be done, get another expert. - David Ben-Gurion
We called in several experts on the subject, but they couldn't reach an agreement.
Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field.
Related words
synonyms
maven
specialist
hyponyms
connoisseur
coordinate terms
initiate (anyone initiated, anywhere from basic familiarity to expertise)