An expert is someone who knows a ton about the subject at hand. The adjective form of expert describes someone or something that has that special knowledge. If you get expert instruction, that means an expert is your teacher.

The word expert is related to experience, and to be an expert at something you need experience. While your academic honors might suggest that you're an expert in certain areas, like rocket science, other fields — like wake boarding and tattoo art, for example — require more hands-on experience before you're an expert. The word expert is also an adjective: once you become really good at it, people will say you're an expert snake handler.

Definitions of expert

n a person with special knowledge or ability who performs skillfully

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William Tell
a Swiss patriot who lived in the early 14th century and who was renowned for his skill as an archer; according to legend an Austrian governor compelled him to shoot an apple from his son's head with his crossbow (which he did successfully without mishap)
Jeremy Bentham
English philosopher and jurist; founder of utilitarianism (1748-1831)
Alphonse Bertillon
French criminologist (1853-1914)
Luther Burbank
United States horticulturist who developed many new varieties of fruits and vegetables and flowers (1849-1926)
Sebastian Cabot
son of John Cabot who was born in Italy and who led an English expedition in search of the Northwest Passage and a Spanish expedition that explored the La Plata region of Brazil; in 1544 he published a map of the world (1476-1557)
Joseph Campbell
United States mythologist (1904-1987)
Charles Eames
United States designer noted for an innovative series of chairs (1907-1978)
Bartolommeo Eustachio
Italian anatomist who was one of the fathers of modern anatomy; noted for descriptions of the ear and the heart (1520-1574)
Herbert McLean Evans
United States anatomist who identified four pituitary hormones and discovered vitamin E (1882-1971)
Gabriele Fallopius
Italian anatomist who first described the Fallopian tubes (1523-1562)
Greek anatomist whose theories formed the basis of European medicine until the Renaissance (circa 130-200)
Camillo Golgi
Italian histologist noted for work on the structure of the nervous system and for his discovery of Golgi bodies (1844-1926)
Huig de Groot
Dutch jurist and diplomat whose writings established the basis of modern international law (1583-1645)
Oliver Wendell Holmes Jr.
United States jurist noted for his liberal opinions (1841-1935)
William Stanley Jevons
English economist and logician who contributed to the development of the theory of marginal utility (1835-1882)
Marcello Malpighi
Italian anatomist who was the first to use a microscope to study anatomy and was among the first to recognize cells in animals (1628-1694)
John Marshall
United States jurist; as chief justice of the Supreme Court he established the principles of United States constitutional law (1755-1835)
Georg Meissner
German anatomist (1829-1905)
Gerardus Mercator
Flemish geographer who lived in Germany; he invented the Mercator projection of maps of the globe (1512-1594)
Johannes Peter Muller
German physiologist and anatomist (1801-1858)
(Greek mythology) a wise old counselor to the Greeks at Troy
Annie Oakley
United States sharpshooter who was featured in Buffalo Bill's Wild West Show (1860-1926)
Sir Richard Owen
English comparative anatomist and paleontologist who was an opponent of Darwinism (1804-1892)
Charles Sanders Peirce
United States philosopher and logician; pioneer of pragmatism (1839-1914)
Willard Van Orman Quine
United States philosopher and logician who championed an empirical view of knowledge that depended on language (1908-2001)
Santiago Ramon y Cajal
Spanish histologist noted for his work on the structure of the nervous system (1852-1934)
Grigori Efimovich Rasputin
Siberian peasant monk who was religious advisor in the court of Nicholas II; was assassinated by Russian noblemen who feared that his debauchery would weaken the monarchy (1872-1916)
Henry Martyn Robert
United States parliamentary authority and author (in 1876) of Robert's Rules of Order (1837-1923)
Bertrand Arthur William Russell
English philosopher and mathematician who collaborated with Whitehead (1872-1970)
the Shoshone guide and interpreter who guided the Lewis and Clark expedition part of the way
Matthias Schleiden
German physiologist and histologist who in 1838 formulated the cell theory (1804-1881)
Theodor Schwann
German physiologist and histologist who in 1838 and 1839 identified the cell as the basic structure of plant and animal tissue (1810-1882)
Harlan Fiske Stone
United States jurist who served on the United States Supreme Court as chief justice (1872-1946)
John Venn
English logician who introduced Venn diagrams (1834-1923)
Andreas Vesalius
a Flemish surgeon who is considered the father of modern anatomy (1514-1564)
Samuel Wiesenthal
Austrian investigator of Nazi war crimes (born in 1908)
Kaspar Friedrich Wolff
German anatomist (1733-1794)
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ace, adept, champion, genius, hotshot, maven, mavin, sensation, star, superstar, virtuoso, whiz, whizz, wiz, wizard
someone who is dazzlingly skilled in any field
an expert in soil management and field-crop production
all arounder, all-rounder
a versatile person who is expert at many things
someone who is skilled at analyzing data
an expert who studies financial data (on credit or securities or sales or financial patterns etc.) and recommends appropriate business actions
an expert in anatomy
antiquarian, antiquary, archaist
an expert or collector of antiquities
arbiter, supreme authority
someone with the power to settle matters at will
archer, bowman
a person who is expert in the use of a bow and arrow
an expert whose views are taken as definitive
black belt
a person who attained the rank of expert in the martial arts (judo or karate)
cabalist, kabbalist
an expert who is highly skilled in obscure or difficult or esoteric matters
calculator, computer, estimator, figurer, reckoner
an expert at calculation (or at operating calculating machines)
someone who is expert in climatology
computer expert, computer guru
an authority on computers and computing
an expert in the use of cosmetics
efficiency engineer, efficiency expert
an expert in increasing the efficient use of machines and personnel
a person skilled in exegesis (especially of religious texts)
an expert in genealogy
an expert on geography
horticulturist, plantsman
an expert in the science of cultivating plants (fruit or flowers or vegetables or ornamental plants)
someone who investigates
jurist, legal expert
a legal scholar versed in civil law or the law of nations
lapidarist, lapidary
an expert on precious stones and the art of cutting and engraving them
logician, logistician
a person skilled at symbolic logic
an expert in the use of mnemonics; someone able to perform unusual feats of memory
an expert on mythology
an intelligent but single-minded expert in a particular technical field or profession
commentator, observer
an expert who observes and comments on something
someone who is excellent at something
an expert in parliamentary rules and procedures
past master
someone who has long and thorough experience in a given activity
an expert in prosthetics
an expert in the study of ferns
guide, pathfinder, scout
someone who can find paths through unexplored territory
a person who is unusually skilled in certain ways
shooter, shot
a person who shoots (usually with respect to their ability to shoot)
specialiser, specialist, specializer
an expert who is devoted to one occupation or branch of learning
a person who possesses unusual innate ability in some field or activity
someone known for high skill in some intellectual or artistic technique
an expert who is a member of a highly skilled elite group
healer, therapist
a person skilled in a particular type of therapy
old hand, old stager, old-timer, oldtimer, stager, veteran, warhorse
an experienced person who has been through many battles; someone who has given long service
enologist, fermentologist, oenologist
a specialist in wine making
a therapist who practices naprapathy
a person who adds numbers
adjuster, adjustor, claim agent, claims adjuster, claims adjustor
one who investigates insurance claims or claims for damages and recommends an effective settlement
adviser, advisor, consultant
an expert who gives advice
a therapist who makes suffering more endurable
credit analyst
an analyst who studies the financial statements and financial history of applicants for credit in order to evaluate their creditworthiness
financial analyst, securities analyst
an analyst who studies the financial performance of corporations
industry analyst
an analyst of conditions affecting a particular industry
market analyst
an analyst of conditions affecting a market (especially the stock market)
a commentator who writes notes to a text
an analyst who assays (performs chemical tests on) metals
a specialist assigned to the staff of a diplomatic mission
number cruncher
someone able to perform complex and lengthy calculations
a specialist in canon law
cartographer, map maker
a person who makes maps
a therapist who practices chiropractic
comparative anatomist
anatomist who compares the anatomy of different animals
cognoscente, connoisseur
an expert able to appreciate a field; especially in the fine arts
coroner, medical examiner
a public official who investigates by inquest any death not due to natural causes
a specialist in criminology
a specialist in crystallography
a Mexican woman who practices healing techniques inherited from the Mayans
a Mexican man who practices healing techniques inherited from the Mayans
an investigator engaged or employed in obtaining information not easily available to the public
a logician skilled in dialectic
dietician, dietitian, nutritionist
a specialist in the study of nutrition
educationalist, educationist
a specialist in the theory of education
someone who specializes in the treatment of disease by electricity
evaluator, judge
an authority who is able to estimate worth or quality
examiner, inspector
an investigator who observes carefully
fingerprint expert, fingerprint man, fingerprint specialist
a specialist in identifying fingerprints
gardener, nurseryman
someone who takes care of a garden
a specialist in the study of Germanic language or culture or literature
designer, graphic designer
someone who specializes in graphic design
graphologist, handwriting expert
a specialist in inferring character from handwriting
anatomist who specializes in the microscopic study of animal tissues
herb doctor, herbalist
a therapist who heals by the use of herbs
high priest
a preeminent authority or major proponent of a movement or doctrine
hunting guide
guide to people hunting in unfamiliar territory
intelligence analyst
a government analyst of information about an enemy or potential enemy
decorator, designer, house decorator, interior decorator, interior designer, room decorator
a person who specializes in designing architectural interiors and their furnishings
a specialist in the study of freshwater ponds and lakes
an authority on liturgies
a medieval English archer who used a longbow
crack shot, marksman, sharpshooter
someone skilled in shooting
master, professional
an authority qualified to teach apprentices
a specialist who studies processes in the earth's atmosphere that cause weather conditions
a jurist who interprets Muslim religious law
a therapist who practices naturopathy
a government appointee who investigates complaints by private persons against the government
oculist, optometrist
a person skilled in testing for defects of vision in order to prescribe corrective glasses
a specialist in oriental subjects
osteologer, osteologist
an anatomist who is skilled is osteology
osteopath, osteopathist
a therapist who manipulates the skeleton and muscles
physical therapist, physiotherapist
therapist who treats injury or dysfunction with exercises and other physical treatments of the disorder
clinical psychologist, psychotherapist
a therapist who deals with mental and emotional disorders
a traditional Zulu healer and respected elder
gun, gunman
a person who shoots a gun (as regards their ability)
speech therapist
a therapist who treats speech defects and disorders
actuary, statistician
someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums)
a person who subtracts numbers
syllogiser, syllogist, syllogizer
logician skilled in syllogistic reasoning
symbolic logician
a person skilled at symbolic logic
systems analyst
a person skilled at systems analysis
a specialist in the history of the Teutonic people or language (especially with respect to the Teutonic influence on the history of England)
track star
a star runner
someone who marks a trail by leaving blazes on trees
a person who engages in shooting at clay pigeons that are hurled into the air by a trap
arborist, tree surgeon
a specialist in treating damaged trees
UNIX guru
an expert on the UNIX operating system
Type of:
individual, mortal, person, somebody, someone, soul
a human being

adj having or showing knowledge and skill and aptitude

“an expert job”
adept, good, practiced, proficient, skilful, skillful
having or showing or requiring special skill

adj of or relating to or requiring special knowledge to be understood

having or showing or requiring special skill

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