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
  1. noun
    a person with special knowledge or ability who performs skillfully
    synonyms: pundit
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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
  2. adjective
    having or showing knowledge and skill and aptitude
    “an expert job”
    synonyms: adept, good, practiced, proficient, skilful, skillful
    having or showing or requiring special skill
  3. adjective
    of or relating to or requiring special knowledge to be understood
    synonyms: technical
    having or showing or requiring special skill
Word Family

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