expertise UK /ˌɛkspɜːˈtiːz/US /ˌɛkspɚˈtis/noun 2verb 1forms 3 noun2 •Great skill or knowledge in a particular field or hobby.He spoke of Scotland's hydroelectric projects in Africa, local expertise shared with the world's poor. — 2014 •Advice, or opinion, of an expert. verb1 •(rare) To supply with expert knowledge or advice.Since 1979, we have developed a method for expertising the design of the processes and improving them. — 1985 formsexpertised · expertising · expertises