n. great skill or knowledge in a particular field or hobby
n. advice, or opinion, of an expert
The Century Dictionary and Cyclopedia
n. An examination by experts; a survey by a board of skilled examiners of any obscure or doubtful ease in order to establish a foundation upon which the court may base an intelligent and definite judgment.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. skillfulness by virtue of possessing special knowledge
Word Usage
"While China has a massive pool of outsourcing professionals, special domain expertise is crucial in order to maintain a competitive edge."