WordReference Random House Learner's Dictionary of American English © 2017
ex•per•tise1 /ˌɛkspɚˈtiz/USA pronunciation   n. [uncountable]
  1. expert skill or knowledge.

WordReference Random House Unabridged Dictionary of American English © 2017
ex•per•tise1  (ek′spər tēz),USA pronunciation n. 
  1. expert skill or knowledge;
    know-how:business expertise.
  2. a written opinion by an expert, as concerning the authenticity or value of a work of art, manuscript, etc.
  • French: survey, report (made by experts); -ise taken as an abstract noun, nominal suffix. See expert, -ise2
  • 1865–70

ex•pert•ise2  (ekspər tīz′),USA pronunciation v.t., v.i.,  -ised, -ising. [Chiefly Brit.]
  1. British Termsexpertize.

WordReference Random House Unabridged Dictionary of American English © 2017
ex•pert•ize  (ekspər tīz′),USA pronunciation v.t., v.i.,  -ized, -iz•ing. 
  1. to study or investigate as an expert.
Also,[esp. Brit.,] expertise. 
  • expert + -ize 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::

expertise /ˌɛkspɜːˈtiːz/ n
  1. special skill, knowledge, or judgment; expertness
Etymology: 19th Century: from French: expert skill, from expert

'expertise' also found in these entries:
Collocations: has [gained, reached, achieved] an expertise level (in), the [necessary, required] expertise (to), [genuine, proven] expertise in, more...

Forum discussions with the word(s) "expertise" in the title:

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