Etymology
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expertise (n.)

"quality or state of being an expert," 1868, from French expertise (16c.) "expert appraisal, expert's report," from expert (see expert (adj.)). Earlier and more English was expertness (c. 1600).

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Definitions of expertise

expertise (n.)
skillfulness by virtue of possessing special knowledge;
Synonyms: expertness
From wordnet.princeton.edu