A naive question about WKB approach. It is dubbed to be a " semiclassical" method. What is precisely mean in this quantum mechanical context to be "semiclassical" precisely? Wikipedia states that generally semiclassical methods just mean that one part of system is described classically, another quantum mechanically. But what is WKB precisely the classical part?

Isn't it naively thinking purely non classical since we expand the solution ansatz in $\hbar$? Where sits the precise reason to call it nevetheless "semiclassical" approach?

Can from this example an abstract reason or indication be extracted when an approximation applied to a pure quantum mechanical system should be regarded as semiclassical?