a person who has special skill or knowledge in some particular field; specialist; authority: a language expert.
Military.
the highest rating in rifle marksmanship, above that of marksman and sharpshooter.
a person who has achieved such a rating.
adjective
possessing special skill or knowledge; trained by practice; skillful or skilled (often followed by in or at): an expert driver; to be expert at driving a car.
pertaining to, coming from, or characteristic of an expert: expert work; expert advice.
verb (used with object)
to act as an expert for.
Origin of expert
1325–75; Middle English (adj.) <Latin expertus, past participle of experīrī to try, experience
Postal workers and independent experts say that has caused mail to pile up in post offices and caused multiday delays in localities across the country.
Federal judge issues temporary injunction against USPS operational changes amid concerns about mail slowdowns|Elise Viebeck, Jacob Bogage|September 17, 2020|Washington Post
She added that she felt Pence’s top officials often showed derision toward the administration’s medical experts.
Former Pence aide says she will vote for Biden because of Trump’s ‘flat out disregard for human life’ during pandemic|Josh Dawsey|September 17, 2020|Washington Post
His suspicions are out of step with the views of election experts and many within his own party, who are building large-scale vote-by-mail programs.
Vote by mail: Which states allow absentee voting|Kate Rabinowitz, Brittany Mayes|September 17, 2020|Washington Post
Unless we have a dermatologist, a doctor, an expert co-sign that product, we don’t cover it.
States have broad power — known as “police power” — to protect public health in an emergency, even when doing so infringes on individual liberties, legal experts say.
Courts may reconsider temporary coronavirus restrictions as pandemic drags on|Anne Gearan, Karin Brulliard|September 16, 2020|Washington Post
“He was a brave field commander and an expert in intelligence, and in organizing popular and tribal forces,” said the eulogist.
What an Iranian Funeral Tells Us About the Wars in Iraq|IranWire|January 6, 2015|DAILY BEAST
Well, one expert I talked to said that physically it involves little more than a $20 cable.
Red Tape and Black Boxes: Why We Keep ‘Losing’ Airliners in 2014|Clive Irving|December 29, 2014|DAILY BEAST
An expert in education talks about race relations, the political environment and what can be done to improve things.
Dr. Howard Fuller's Injustice Education|Campbell Brown|December 21, 2014|DAILY BEAST
Carter has also been a fixture on boards and expert panels, in think tanks and at universities.
Ashton Carter, the Wonk Who Would Lead the Pentagon|Shane Harris, Tim Mak|December 2, 2014|DAILY BEAST
Peacock served as an expert witness on grizzlies in federal court for Glacier National Park.
What It Takes to Kill a Grizzly Bear|Doug Peacock|November 23, 2014|DAILY BEAST
He was expert in the use of quadrant and sextant, and could take a lunar observation and work it out with accuracy.
Siam|George B. Bacon
That, I take it, is the essence of beauty—not that I am learned in beauty, though I am an expert in ugliness.
Francezka|Molly Elliot Seawell
The "Be Discreet" of the Beard was a gag, which he rolled round the servant's head in expert fashion.
Messengers of Evil|Pierre Souvestre
He showed them to a number of expert jewellers, chemists, and geologists.
Boys' Second Book of Inventions|Ray Stannard Baker
Major Anderson was an expert reader of these photographs, and he taught me all I know about the subject.
Q.6.a and Other places|Francis Buckley
British Dictionary definitions for expert
expert
/ (ˈɛkspɜːt) /
noun
a person who has extensive skill or knowledge in a particular field
adjective
skilful or knowledgeable
of, involving, or done by an expertan expert job
Derived forms of expert
expertly, adverbexpertness, noun
Word Origin for expert
C14: from Latin expertus known by experience, from experīrī to test; see experience