How is Mid Fi defined?

Anyone feel free to correct my interpretation, but I think mid-fi is those brands which used to be above the big box stores, but were not top shelf components.
A few years back one might have considered Rotel, Adcom, Vincent, some Marantz, low end Paradigm, low end B&W, low end PSB, stuff like that.
Nicer than what Best Buy sells, but not the most expensive stuff at a full fledged high end shop.
The lines are getting quite smeared though by some of the aforementioned companies coming out with spectacular sounding products at previously unattainable prices, and some of the higher end companies bringing lower cost products to the big box stores.

Hi fi: what I can't afford.

Mid fi: what I might be able to afford.

Lo fi: what I can afford, but don't necessarily want to listen to.

@Tvad: Amen.
@Mceljo: Has "hifi" been defined?

I don't think that Hi Fi, Mid Fi or Low Fi can be defined in a way that very many would agree, but since I've seen it referenced several times I figured I'd ask what it means to different people. I hadn't really considered that my speakers were anything but Hi Fi, but after seeing what level of gear is available they just might fit the bill.

I guess I might consider my Focal Chorus series speakers Mid Fi because they are technically a "budget" line of speakers.

Also, it might be reasonable to consider Mid Fi to be having a home theater receiver rather than a dedicated two channel amplifier.