expertise

expertise — noun

1. the deep understanding and practical ability that someone gains through training

1.nounB2
Definition

the deep understanding and practical ability that someone gains through training and long experience in a particular field

Example

Dr. Yan's expertise in heart surgery saved the young patient's life.

expertise in + field of medicine

Over twenty years, Rania developed her expertise in environmental law.

develop expertise in [field] over [time]

Common collocations
  • develop expertise
  • gain expertise
  • technical expertise
  • professional expertise
  • expertise in
  • share expertise
  • area of expertise
  • field of expertise
Synonyms
  • skill

    broader and more general; skill can refer to any learned ability, while expertise implies a deeper, specialist level

  • know-how

    informal register; focuses on practical, hands-on knowledge rather than theoretical understanding

  • proficiency

    emphasises competence measured against a standard; often used for languages or technical tasks

  • mastery

    implies complete control and comprehensive understanding, a level beyond expertise

Antonyms

Grammar Patterns

expertise in + field/activity

Usage Note

Frequently uncountable; not used with 'a' or 'an' in most contexts. The preposition 'in' is the most common pattern (expertise in something), though 'on' also appears when referring to a topic (expertise on global trade).

Common Mistakes

She has an expertise in marketing.
She has expertise in marketing.
'expertise' is uncountable and does not take an indefinite article.
He has many expertises in different fields.
He has expertise in many different fields.
'expertise' is not commonly used in the plural.

Word family

Synonym discussion

Sense: noun/1

Expertise refers to deep, specialised knowledge and ability gained through experience or training — it is narrower and more advanced than general skill. Skill is a broader term that covers any learned ability, from basic to high levels. Know-how is informal and practical, often describing technical or hands-on procedures rather than theoretical knowledge. Proficiency suggests competence and measured ability, especially in languages or tools, but does not reach the depth of expertise. Mastery implies complete command and comprehensive understanding, going beyond expertise to near-perfect control. For example: 'She has skill in the kitchen' is a general statement; 'Her expertise in molecular gastronomy is well known' specifies a specialised field. 'He has the technical know-how to repair any engine' focuses on practical ability; 'Her mastery of the violin is extraordinary' suggests perfection.

skill ↗know-howproficiencymastery

Common collocations

Nouns

Phrases

  • area of expertise
  • field of expertise
  • level of expertise
  • range of expertise
  • body of expertise

Prepositions

Etymology

FrenchEnglish

Borrowed from French 'expertise', which originally meant an expert's appraisal or evaluation report. It was formed from 'expert' (adjective) plus the noun suffix '-ise'. The word entered English in legal contexts during the 19th century and gradually broadened to describe a person's specialised knowledge and practical skill in any field.