expertise
n. uncountablen. high-level knowledge or skill in a specific area. You gain this by studying or practicing something for a long time.
n. expert skill or knowledge in a particular field. Often implies a combination of theoretical understanding and practical proficiency acquired through extensive experience.
She has a lot of expertise in computer programming.
The company is looking for a consultant with specific expertise in international tax law to help with the merger.
While many claim to be authorities on the subject, few possess the technical expertise required to navigate the ethical implications of genetic engineering.
Borrowed from French expertise.
Frequently paired with the prepositions 'in' or 'on' to specify the field of knowledge.
He has many expertisesHe has a lot of expertiseExpertise is uncountable; it cannot be used in the plural form to mean 'skills'.