a person with special knowledge or ability who performs skillfully
"The team relied on an expert to guide them through the complex technical repairs."
A person with extensive knowledge or ability in a given subject.
"After years of studying marine biology, Dr. Chen became an expert on deep-sea coral ecosystems."
In plain English: An expert is someone who knows a lot about a specific subject and can do it very well.
"She is an expert on local hiking trails and always knows the best routes to take."
Usage: Use "expert" to describe someone who possesses deep knowledge or high skill in a specific field. Do not use it to mean "specialist" when referring only to someone who has just begun studying the subject.
having or showing knowledge and skill and aptitude
"adept in handicrafts"
"an adept juggler"
"an expert job"
"a good mechanic"
"a practiced marksman"
"a proficient engineer"
"a lesser-known but no less skillful composer"
"the effect was achieved by skillful retouching"
Extraordinarily capable or knowledgeable.
"After years of restoring ancient clocks, she became an expert who could identify a mechanism's age by its wear patterns alone."
In plain English: An expert is someone who knows a lot about something and can do it very well.
"The expert chef prepared a delicious meal for us."
Usage: Use "expert" as an adjective to describe someone who possesses exceptional skill or deep knowledge in a specific field, such as calling her an expert witness. It functions correctly before the noun it modifies, like an expert driver, rather than after it unless part of a specific phrase like "expert in."
The word entered English via the Old French term expert, which originally meant "experienced." It ultimately traces back to the Latin verb experior, meaning "to try" or "test," reflecting a shift in focus from testing something to gaining experience through that process.