An embedded system is a typically fixed function device where the end user is not provided with the ability to service the software. Think a microwave oven or a TV. It is a description of functionality and intent, not hardware form factor.
A PC without a general purpose OS is embedded and the Raspberry PI with Debian and Gnome desktop isn't.
In any case it doesn't matter how you call it, as that is the kind of system I meant in my initial post. We use words to convey shared meaning and that is what embedded means traditionally.