Definition

1. Adjective:

   • Having or involving a high degree of skill or knowledge in a particular field: Possessing special skill or knowledge derived from extensive experience or training.
   • Of or relating to a specialized subject: Pertaining to or requiring expert knowledge to be understood.

2. Noun:

   • A person with special skill or knowledge in a particular area: Someone who has a comprehensive and authoritative knowledge of or skill in a particular subject, often gained through extensive experience or training.

Usage Examples

• Adjective:
  • She is an expert chess player. (She possesses a high level of skill in chess.)
  • The report provided an expert analysis of the economic trends. (The analysis was performed with specialized knowledge.)
• Noun:
  • We consulted an expert on climate change. (We sought advice from a person with specialized knowledge in climate science.)
  • He is a leading expert in artificial intelligence. (He is a foremost authority in the field of AI.)

Advanced Usage

• "To be expert at/in something": To be highly skilled or knowledgeable in a specific area.
  • She is expert at solving complex mathematical problems.
• "Expert witness": A person who is permitted to testify in a court of law because of special knowledge or proficiency in a particular field relevant to the case.
  • The defense called an expert witness to discuss the forensic evidence.

Variants and Related Words

• Expertise (n): Expert skill or knowledge in a particular field.
  • His technical expertise was invaluable to the project.
• Expertly (adv): In a very skillful manner.
  • The surgeon performed the operation expertly.

Synonyms

• Adjective: Skilled, proficient, adept, masterful, accomplished.
• Noun: Specialist, authority, professional, master, connoisseur.

Antonyms

• Adjective: Inexpert, unskilled, amateur, incompetent.
• Noun: Amateur, novice, beginner, layperson.

Related Idioms and Phrases

• "In an expert capacity": Acting with the authority or role of a specialist.
  • He was hired in an expert capacity to oversee the safety protocols.
• "Expert opinion": A judgment or viewpoint formed by someone with specialized knowledge.
  • Before making a decision, we should seek an expert opinion.

Adjective

1. of or relating to or requiring special knowledge to be understood
   • technical terminology
   • a technical report
   • technical language
2. 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

Noun

1. a person with special knowledge or ability who performs skillfully