Expertise (noun)

1. Specialized knowledge or skill in a particular field.
2. The skill or ability of a particular person or organization.

Origin:

Early 17th century (in the sense "expertness"): from french, or from late latin expertus "experienced", past participle of experiri "try, test".

Examples:

1. The company hired him for his expertise in computer programming.
2. The doctor's expertise in neurology was sought after by many patients.
3. She developed expertise in the field after many years of experience.
4. The company's expertise in the industry was a major factor in its success.
5. His expertise in the subject made him a sought-after speaker at conferences.