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.8 September 2014, Michael White, “Roll up, roll up! The Amazing Salmond will show a Scotland you won't believe”, in The Guardian:
Two HIV-positive teens, Jennifer Jako and Rebecca Guberman, had decided to make a film out of their own and other teens' experience with HIV, although they had no expertise when they started.2002, International Documentary Association (contributor), International Documentary, The Newsletter of the International Documentary Association, volume 21, page 28:
Since 1979, we have developed a method for expertising the design of the processes and improving them.1985, Energy Research Abstracts, page 2720:
Including a plurality of different expertise in the decision-making processes corresponds to expertising the democratic procedures.2010, Donald Gray, Laura Colucci-Gray, Elena Camino, Science, Society and Sustainability, page 20:
1 more example
If experts shall lose their expertise, wherewith shall they be expertised? The fact that only the rare economists can be entrusted with economics is not reason to discard economics, but to go and find the rare men.2011, Jens O. Parsson, Dying of Money, page 249: