noun which may take the genitive case particle 'no'
Used as a no-adjective to describe something of the highest international standard, often in sports, business, or quality.
彼はワールドクラスの選手だ。
He is a world-class athlete.
このホテルはワールドクラスのサービスを提供している。
This hotel offers world-class service.
Variant with a middle dot, sometimes used to clarify the word boundary.
Borrowed from English 'world-class'.