I have to add my vote to the technical definition... 2 layers of fabric (whole or pieced) separated by a layer of filler (batting, wadding, or other insulative material) and stitched together in some form ( either continuos stitches, or tied, or a combination of the 2).
How those fabric layers are treated, be it pieced, applique'd, paper pieced, or left whole should not change the definition.
Treatments applied to the surface of the fabric are just that... surface treatments... again they neither make or break the concept of quilt.