A wireframe is a line graphic plan, guiding UI designers in the interface production. It is a well-thought document in the form of schemes, that displays functional elements of future product at their place. Wireframe main aim is to demonstrate what happens on a particular page, how it works. So, it does not refer to any style or aesthetic of a future product.
Functionally, the wireframe is close to the architectural plan, as they both have the same purpose.