/ ˌekspɜːˈtiːz; NAmE -pɜːrˈt-/ noun
[ U ] expertise (in sth / in doing sth) expert knowledge or skill in a particular subject, activity or job :
professional / scientific / technical, etc. expertise
They have considerable expertise in dealing with oil spills.
We have the expertise to help you run your business.
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WORD ORIGIN
mid 19th cent.: from French , from expert , from Latin expertus , past participle of experiri try.