expertise
noun [ U ]
uk/ˌekspɜːˈtiːz/ usa high level of knowledge or skill:
pick up/gain/develop expertise I've been in this job for thirty years, and I've picked up a good deal of expertise along the way.
expertise in sth He is a logical choice given his expertise in consumer marketing.
specialist/technical/professional expertise
engineering/management/design expertise
the expertise to do sth You will need someone with the expertise to handle confusing technical regulations.
The problem comes when a manager strays outside his area of expertise.