expertise
/ˌɛkspɚˈtiːz/
noun
Britannica Dictionary definition of EXPERTISE
[noncount]
:
special skill or knowledge
:
the skill or knowledge an expert has
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His expertise on defense will help the team.
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her expertise in legal matters
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The company has no environmental expertise. [=the company does not have experience with environmental problems, matters, etc.]
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This question falls outside my area of expertise. [=this question is about something I do not know much about]