Definition of expertise noun from the Oxford Advanced American Dictionary

  

expertise

 noun
noun
NAmE//ˌɛkspərˈtiz//
 
[uncountable]
 
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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. It is difficult to find staff with the level of expertise required for this job. expertise in something/in doing something They have considerable expertise in dealing with oil spills.
See the Oxford Advanced Learner's Dictionary entry: expertise