/ˌekspɜːrˈtiːz/
ex·pert·ise AW
BrE /ˌekspɜːˈtiːz/
NAmE /ˌekspɜːrˈtiːz/
[U]
expert knowledge or skill in a particular subject, activity or job
professional/scientific/technical, etc. expertise
We have the expertise to help you run your business.
~ in sth/in doing sth
They have considerable expertise in dealing with oil spills.