late 14c., "having had experience; skillful," from Old French expert, espert "experienced, practiced, skilled" and directly from Latin expertus (contracted from *experitus), "tried, proved, known by experience," past participle of experiri "to try, test" (see experience). The adjective tends to be accented on the second syllable, the noun on the first. Related: Expertly; expertness.
expert (n.)
early 15c., "person wise through experience," from expert (adj.). The word reappeared 1825 in the legal sense, "person who, by virtue of special acquired knowledge or experience on a subject, presumably not within the knowledge of men generally, may testify in a court of justice to matters of opinion thereon, as distinguished from ordinary witnesses, who can in general testify only to facts" [Century Dictionary].
例文
1. You 'll also get expert advice on keeping your hair in good condition.
髪質を良好に保つ方法に関する専門家のアドバイスも得られます。
2.I 'm a limited and obtuse clergyman while you 're the expert .
あなたは専門家で、私は能力の限られた愚かな牧師です。
3.His papers were proof against all but the most expert of scrutinies.
彼の論文はほとんど最も専門的な審査に耐えられる。
4.There is a great deal to learn from Hal 's expert approach.
ハルの熟練した方法から多くを学ぶことができる。
5.I 'm no expert ，but I don 't think Tracy died a natural death.